Do you have room for something wider than the average 30" tub while still maintaining the required 15" of clearance from the center of any adjacent fixtures? Otherwise. 30" is on the narrow side for a shower.

I think it's great that you decided to update your bathroom this way!

If you want to include an integrated tiled bench I would opt for a corner one. A bench the length of the shorter side might make it difficult to place your shower entrance depending on the position of elements outside your shower. An other option would be to get a small freestanding teak bench that can be moved around.

This might be practical for your project: Schluter Kerdi Shower Bench

Here is a bath to shower conversion I did for a client:

After:

BEFORE & AFTERS · More Info

BEFORE & AFTERS · More Info

My neighbor put in a nook or ledge to put your foot on for shaving. I put in metal corner seats that were covered in tile...use either way. We've done 3 and on one we replaced a garden tub and built a pony wall, tiled to create a shelf the length of the shower. We used cast iron, sterling Vikrell and enameled steel pans. Our plumber set the Vikrell pan in mortar, but the steel said mortar voided warranty...mortar install is much nicer. Of course cast iron will last 100 years.