Is this new construction or a remodel? How does the bathroom relate to the surrounding rooms? Why two shower heads (shower is not large enough for two)? Why a corner bench, (the shower is not that large and I would use a teak bench as opposed to a built in)? Where are you planning the controls?

New construction, controls are under the shower heads. I can’t increase the size of the shower, we’re framed and increasing it would make the surrounding bathroom space too small. Corner bench will just be floating, architect drew a bench along the back but I’ve realized we don’t have space for that. Thanks for the help.

Suggest slide bar at #3. Delete corner seat and get free standing teak seat that gives more flexibility in the space.

I'd do a wall-hung, fold-up teak seat to save space. Agree that's a very small shower for two showerheads.

This shower does not need or even should have 2 shower heads , no installed seat and why a swing door in a small space . You do know architects are not usually good at interior design for bathrooms and kitchens .THis shower is barely longer than a tub no need for 2 heads ,

controls are under the shower heads

What others have said...you don't need or have room for two shower heads. And with the swing door on the left, you can't reach the shower controls on the left from outside the shower anyway. So no one will ever want to use the spray head on that end of the shower.

That shower isnt big enough for all that. Ditch the second head on the right for a bench. You don’t have the room for 2 heads to be used anyway.

A 48' linear drain in a 66" shower is going to be incredibly awkward on the ends where you will have to have a slope inward to the drain. You will end up with a "channel" where the two planes meet, and that's not going to be easy to stand over. A linear drain needs to run the full width, and in this case, if you place a 48" drain at the right , running top to bottom, with a bench behind it, the 4' drain will work. Otherwise, you need the full 66" drain at the rear.

This shower is a bit longer, but this is where we placed the fixed shower head and the handheld w/bar. Also have a freestanding teak bench on the left side.

The linear drain sits behind the bench.

Door swings in and out and is 36" wide.

Teak bench we have (shown in another shower in the house).