Never heard of such a thing.

The install above has the door hinged on the wall and the two other pieces form an "L" for strength.

Ask the glass guy if you bring one piece of glass to the ceiling if they will let you do this. There is a trend in glass guys straying from the spec you see above in the picture because the "L" shaped glass can shift over time.

Good Luck

My shower is about 36"x 48" - I did the "strip" on the fixed panel side because it was slightly cheaper than the hinges and I'm happy with the looks. No issues.

Mrs . Hayne that is a different set up. The strip is called a U Channel and would not help the original poster. The weight of your door supported by the wall and the fixed piece of glass is less than 24" wide.

Actually john her system isn't different. If you read my op again I said frameless with u channel.

Yes but your example shows three piece of glass with a 90 degree connection. The example above is 2 pieces. They are different installs.

The weight of glass and width is key to which can be done and with what clips or channels.

No. Look again. I didn't post an example. Mine is two pieces with u channel.

Lol (I'm reading the comments thus far)..

I did learn I have the u channel set up. Thanks John.

Back to the org post, I'm no pro but my shower is about 46 inches wide. If you have a 42" opening then can't the installer do a set up similar to mine, but with a door that is a couple inches less in width? The door I have is the widest I could go, per the installer, so I don't see why you couldn't just do a door a couple inches less in width with the same fixed side???

By the way, my installer let me scroll thru pics on his phone of his past work. I saw all sizes with both u channels (aka the strip lol) and clamps..

My glass is 3/8" thick... Half inch cost more of course. I didn't even have him quote me half inch...

Let us know what you find out