Have you spoken to the folks at The Sliding Glass Door Co? This is their area of expertise.

Hi, were you able to figure out a solution? I'm looking for a double sliding frameless (if possible), and exploring options.

There are tons of such doors available, all over the world:

http://www.bathauthority.com/shower-door-illusion.html

http://mirolin.com/products/shower-enclosures/tri-panel-tub-shower-door

http://www.me.kohler.com/eu/products/category/reach/E50027/index.htm#information

http://www.roltechnik.com/en/shower-enclosure-1/pd3n-p153.html

http://www.ravak.com/en/shower-door-supernova-asdp3

http://www.archiproducts.com/en/products/88467/quadra-niche-shower-cabin-with-sliding-door-prima-glass-2000-duka.html

http://www.dynasty-importers.com.au/products/shower-screens.html?page=shop.product_details&flypage=yagendoo_VaMazing_zoom2.tpl&product_id=374&category_id=7
http://coastalshowerdoors.com/Products/FramelessBypass/TRI-Slide-Frameless-Bypass-Shower-Doors

The links above are for framed, vs the OP and I were looking for frameless, like CRL Serenity. My bathroom guy ended up going with Skyline Cardinal frameless, single fixed + single sliding. He mentioned he "knew a guy" who did 2 bars (stacked vertically), for double sliding panels, but the manufacturer would no longer do this type of design.

Why not go with a linear drain and no walls or doors? Add the bench seat on the side wall. Put in a rain head and it will be great

I am also looking for frameless fixed/sliding door combination. I found this site today, and plan on contacting them. Exactly what I was looking for. Good luck.
http://klein-usa.com/residential-projects/

I just found this today : http://www.menards.com/main/bath/bathing/tub-shower-shower-doors/shower-doors/maax-reg-48-triple-plus-shower-door/p-2095123-c-8353.htm

I'm actually looking to do this same thing for my home shower remodel. Currently I have a swinging door that opens up into the pathway and at 40 inches wide, a single slider just won't be wide enough. Looks like some of the links aren't working anymore and the others are outside the US. Can anyone suggest a place in the US to order a 3 panel sliding shower door from or know of a custom shower place in Northern California? Thanks!

MAAX makes a triple panel slider in various sizes (down to 42"W I believe). OVE Decors makes a frameless triple panel (1 stationary) 60" shower door and tub door. Both can be obtained through Lowes's.

Did anyone find a solution? We're in the same boat! The Klein rep is checking on options for us, the other suggestions above didn't pan out when I researched...

Visit a local glass shop that installs framess shower doors...................

Great advice, I'm sure no one here thought of that. [rolls eyes]

For our accessible shower we put two frameless hinged doors that open like French doors. They swing either way and allow you to open both for wider wheelchair access when needed. I did need to put a floor mounted stop to slightly restrict swing on one side so it stopped before hitting the toilet. The bypass sliders actually would have resulted in a smaller opening with our layout. Good luck!

Thanks! We found a kit from CR Laurence with one fixed + two bypass that recesses into the ceiling. We're waiting for it to arrive and will update if (when?!) it's successful.

I'd be interested in seeing how this works/looks like, out of curiosity sake.

Hi Jason, We're having pictures done next month, I'll try to remember to post!

Hi Brooke Barrett. How did your 1 fixed/2 bypass shower turn out? Working with the same problem. Thanks!

Any updates from anyone? The drawing at the start of the discussion is exactly what I’m looking for as well. Anytime I go anywhere and start to ask for this I get stared at like I’m asking for the moon.

This doesn’t seem like that hard of a request. If anyone has done it successfully, can you please post some pictures? I also need a frameless 3 door system for a smooth transition to the shower for wheel chair access. 3 panels is the only way to make this possible in my small bathroom.

thank you!

I hope this has been resolved over the last 5 years. Come on, Houzz, stick to new dilemmas.

@valinta why are you even posting here if this isn't a concern for you?

Would love to find out if it worked! Dealing with this currently 40in opening and toilet beside the shower so can’t swing out. Would love some hope and inspiration!!!

I'm having the same issue in Ontario, Canada. Alcove shower beside the toilet without enough room for a hinged door and need a wider opening than a double slider will provide. Has anyone come up with a solution? It should not be that difficult to have two tracks in the header for the panels to slide on. Help!

Trying to design a similarly sized bathroom and I ran across this hardware. In the 5th photo you can see how you would need 2 tracks, one for each door that could then be placed on either side of a stationary panel which in my design would go floor to ceiling. It's expensive, and you have to remember there needs to be adequate spacing between the sliding glass doors that are top mounted so they don't bang together and shatter, but I think it could work. For safety purposes, I wouldn't put 2 doors on one side of a fixed panel like shown in the diagram above.

Top Ceiling Mount Brushed Stainless Steel Twin Roller Glass Sliding Barn Door Office Glass Partition Door Hardware Track Set Kit

Wall mounted track would also work, it depends on the bathroom where you would have the support necessary for the weight of thick glass doors and the metal hardware. For maximum function and affordability in small bathrooms, please consider using 1/3 total width fixed panel and a single 1/3 total width door and placing stoppers so it effectively gives you 2/3 coverage which is going to stop almost all of the water if you are mounting your shower head on the same wall as the toilet. (For the example above that would be 20" fixed, 20" on track, positioned to create a 40" shower screen when closed but when open it would be 39"opening, as I previously mentioned.)

This is especially true if you plan to use a rain shower where the water is coming directly down. I have a feeling that will be what I end up doing. Of course, this is only necessary to allow for a wider shower in a small bathroom like the dimensions above or smaller. Mine's less than 100 inches so even with a smaller vanity than the one pictured, I need to conserve as much shower width as I can and 2 tracks would take up space I would rather put to better use. You would need to buy the hardware and then have a place make and install the glass in the dimensions you need if you do it this way rather than buying a kit that has the glass included with the hardware.