Your layout is the best to maximize vanity counter space as well as shower size. Maybe consider moving the towel storage into the pony-wall if you're able to deal with having your towels down low and making your shower go all the way to the right wall.

I would not make the shower deeper than 34 inches or your aisle between the sink and shower will be too narrow. If the shower is 60 X 34. your aisle will be 34 inches. Maybe you should consider a vanity that is 18 or 20 inches deep.

If the plan works plumbing-wise, Jan's idea to move the tower makes sense. It's a logical divider, and puts storage close to all the areas that will need it, including the toilet. And, you can hang your towel on the wall beside the shower so you can reach it without stepping out.

also, if that tower is only 12" wide, the inside will be only about 10-11", so consider using pullout shelves or drawers (especially on the bottom) which will make the available storage space even narrower but it will at least be accessible. I had an 11"-wide cabinet in a bathroom and when we moved I was surprised at what had disappeared into the depths because we couldn't see or reach it. On the toilet side of the tower, have some storage accessed from the side.

Good points people .. thinking about that now. Moving towel storage to the toilet wall sounds logical. We talked this out with the plumber. He said there would not be a lot of $$difference.

We are also thinking about leaving the toilet as is in the drawing and swap the vanity with shower. And then have the entry to shower right by the bathroom entrance. Shower door will open inside to the wall where the vanity is right now. I will draw something up. Wish we had an extra foot for the bathroom depth 8'6". Need to read about how much spacing is ideal between vanity and shower. Back to the drawing board.

Keep the ideas coming!

A vanity and shower separation can be as little as 30 inches, unless you are planning for the long haul In which case you need ROOM for a walker or wheel chair. Right?

If you are used to showering in a tub shower, you will find a 36 x 48 shower to be and feel very roomy. That is because the inside of that tub, is about 22 inches wide!!! You got clean in that , yes? So ...........you know your future needs. Your planned length of stay in your home.

You are trying to get ten pounds of shtuff into a five pound bag. The first image is the layout Jan first mentioned. The second image is meant to inspire more ideas.

More ideas aren't always better ones : ) More plumbing moves aren't always a great idea either. Where is the toilet NOW ? What is the entire bedroom space? If you want a foot more, that's the place to get it, if possible. Drywall and studs are cheap.

They are not better, that's why there's more of them.

My mind is screaming "draw it to scale" until I saw Mark's. Your clearances are tough and you need to understand each after finishes are added. Even an EB vs round bowl will make a difference. Vanity depth... 21, 22, 24? Precise curb placement, etc.