you could finish it with skirting or similar. you may find it hard to get anything else with an ornamental moulding. You can do most of the painting before you fix it.
Are you using ply for the floor? I'd lean towards adding mineral wool in the floor void and the wall studs to muffle noise a bit. and two layers of plasterboard on the wall. Do all the wiring you can think of before closing up.
Are you using ply for the floor? I'd lean towards adding mineral wool in the floor void and the wall studs to muffle noise a bit. and two layers of plasterboard on the wall. Do all the wiring you can think of before closing up.