36'' would not be proportionate to a 72'' width. You'd want 42'' minimum. Not fond of the design overall as clearances appear to be too tight for everything, but with no dimensions, it's difficult to accurately judge. I'd swap the shower and tub so that you could get better walking clearance at the vanity. Or get rid of the tub all together If that's a 72'' tub, as the room wouldn't be wide enough for the layout at all if that were the case.

Assuming the rain heads are low flow rates (2.5 GPM) I would install the one on the left (door side) about 32" from the shower entry. I would think a bath mat will be needed outside the shower entry near the door and would caution you to plan out well the waterproofing process.

Not really sure 2 rain heads is the best design for this shower at all. Perhaps a center rain head and then two wall mounted fixtures that can be angled towards the center a little would be safer.

I think it's too hard to tell what this looks like without a scaled drawing, at least on graph paper.
If the tub is 72+12+12 that's 96" or 8'

36" for the interior of the walk in shower, ~37" exterior +22" for vanity depth with top is 59"

96"-59"= 37" for aisle, which is ok. If there is more room on each end of the tub, you may be able to make the shower a bit wider, but if there is not actually 12" on each end of the tub, things could get a little tight.

Why do you need to be able to walk in and out and each end? is there any reason not to butt one end of the shower against the tub?

Is that a 72" tub, or a 60" tub? 60" is standard.

It's a 72' tub...plus a tile deck on either end...so the room is a lot wider than I've made it look. I'll grab the better plans to share this weekend (won't be back out to the site until then).

But I'm thinking we will close in the left side of the shower with glass...so the walk-in will be by the tub only.

This is the tub - so simple: http://www.maax.com/en/products/bathtubs/rectangular/kava

Appreciate you saying that - when I'm in the space it does seem huge and luxurious. I was a little deflated to receive her comments as my first.

Is your shower fully enclosed?

I am doing an entire 3/4 bathroom that's 48" x 81" including toilet and sink. It's small, but it works without feeling claustrophobic. I think your shower should feel pretty good inside.

Our shower in our new basement bathroom is only 32 wide and it's about 76 long. I love it! Even though it's in the basement, I go down two floors of stairs to shower every day that I don't have to go to work. It's my "spa" shower! (The large blue tiles are 14" tiles.)

Thanks for sharing that picture and your feedback on that size! I measured out our current corner shower and it's 32x32, so having a long narrow shower sounds like heaven to me. Glad you enjoy yours so much! I like your mix of tiles too! Appreciate you taking the time.

The size of the shower is sufficient, but getting three shower heads in there in a practical manner may be tough. It can also depend on how they are intended to be used.

Rainheads in general have a softer flow, so you'll not get as much overspray and droplet rebound from a rain head that you'd get with a typical shower head. Still, to minimize (not eliminate) water from getting outside of the shower and on the bathroom floor you'd be looking at the two heads being about 30" minimum from each end of the shower.

There goes your space.

If the rainheads were to be used by two people simultaneously, you could create a bit of shoulder and elbow room by offsetting the heads from one another, but it'd work better with a wider shower, say 42" instead of 36". Let's say each head is 30" from the ends of the shower. Have one head 16" from the solid wall and the other head 16" from the glass wall. That'd give a 10" lateral buffer of sorts between the heads. Go with the heads 14" from the walls and you get a 14" buffer. That'd put the heads a little over 18" away from each other instead of 12" if there was no offset. It's still tight.

Still, the layout puts the squeeze on the idea of one person using a rain head and another using the handheld, although the handheld could be rotated in its bracket to spray away from the other rainhead.

You could consider adding something along the lines of a 10" glass panel to each end of the shower. That might help contain spray and allow you to move the rainheads closer to the doorways, creating more room in the middle. If you went to 42" wide, you could have an even wider end panel and still maintain the required 22" minimum door opening. The wider end panel would allow you to move the rain heads even closer to the ends of the shower, creating more elbow room in the middle.

With all that written, since your floor will be waterproofed, a little floor water won't kill anything. Towel off, drop your towel on the floor, push the towel around the floor with your foot to mop up any over spray, and get on with your day.

So, no perfect solution. Just some ideas to go along with what the others have offered.

WOW, great feedback and very helpful, thank you.

Just an update...we've decided to glass in the one end (to the left). We're going down to one rain head and one hand held shower head, but with body sprayers added now). I didn't realize the door only had to be 22"...we were going go with 28 or 30, but may scale that down (plus that opening is beside the tub deck so it will feel wider.

I'll take some pictures of what's been framed up thus far.

Lacey it's enclosed. Here is a link to my shower:

Master Bath Shower

We have our rain head shower spray in the ceiling and the hand held on the wall. The rain head is centered in the shower.

22" is bare minmum compliance and it is TIGHT....... 24-26 a good starting point.

It looks good. How large did you wind up making the shower?

Tile looks beautiful. The photo appears to show bare plywood at the end of the curb. Questioning the waterproofing?

I understand that. The waterproofing from the curb to the tub would be installed prior to the tile. Orange is visible. If it is Kerdi membrane it can not be installed on the plywood. What waterproofing is on the tub deck?