Cool. We had a very similar bath here, stupid corner shower, big soaking tub. It was a step down below floor level. First night in the house I went to pee, and walked in the wrong door in the dark, fell down the single step an cracked my head on the tub surround. Came to to paramedics. Refused transport.
We were going to redo anyway, so poured a slab over the existing. Put radient pex in the floor, heated by a little 120v water heater and circ pump. Open shower and freestanding tub.
Good luck w the remodel, sucks while in progress but worth it.