Since I'm renovating this property in the prospects of long term rental, instead of installing a shower with new plumbing, tile, etc.,(which I would do if I intended to try to sell it for top dollar) I'm simply going to add a new faucet to the tub that has a shower stem protruding from the top of the faucet. I'll buy and install a shower curtain rod that will enclose the entirety of the tub, hung from rods from the ceiling. I'll tile all walls that could encounter water spray from the shower/tub. I still haven't figured out what to do with the existing double hung wood window. There's no way to locate the tub and get around it being near the window,hence...water damage from people showering and spraying water all over every nearby surface...which over time creates rot (a property owner's biggest nightmare)...so I'm thinking I might just trash the window and install a nice fixed in place leaded glass piece in it's stead...flush with the tile so that any waterspray will run down to the floor, which will be moisture-renter-proofed as well, with tile.