I'm going to be removing a sliding door tub/shower enclosure (and replacing it with a shower curtain), it's anchored on either side with screws through the tiles, what do I fill these screw holes with once the enclosure is out of there? Just caulk? Grout then caulk? Thanks for any advice you can lend.

Water buildup behind the tile on a properly built unit is marginal. What you get is water vapor for the most part, which generally gravitates to the morter and evaporates on a surface applied build, or on the cement board in a traditional, plastic-over-the-studs application. 100% Silicone should be used at any change-of-plane because of the small, perhaps even microscopic movement that is inevitable there. With a solid, cast tub and mud walls, you could probably "get by" with grouting those joints. With the usual, flimsier tubs, I like to fill with water, thereby "loading" the tub and then caulking in that position so that stress is minimal on the caulk under use and heavy weight.

About 8 months ago I removed what I believe is exactly as you've described: a metal framed sliding glass door from a cast iron bath tub with tile up the walls. (I then promptly destroyed the tile and tub, but that's irrelevant to this discussion...) There had been some holes drilled in the wall tiles, but the tub itself seemed to be fully intact. There was a lot of caulk everywhere that would need to be scraped off and then cleaned up with some sort of chemical. (I found a caulk remover from one of the big box stores that was fairly cheap, easy to use, and didn't do any damage to any acrylic tub so certainly cast iron and tile could handle it.) I'm guessing you also may end up with some holes in your tile where the door is secured that you may need to patch and/or cover with the new door.

So I got an Elmer's Fiberglass repair kit and some white appliance enamel repair. Hope this works to touch up this tub. Although I'm going to have to wait a while till the roommate is gone for a couple of days to do this. I'll then remove the doors, patch the holes left by doing this, cover up the chips with the enamel, and find a nice shower curtain and rod. Is there anything else I should consider doing with this tub? I'm really don't like how short the top of the wall stops. Would there be a clean way to extend this so it goes up higher or to the ceiling, but seamlessly? But I guess this takes me back to my first post and what I decided not to do and that is a liner. But it wouldn't really be a liner because it wouldn't go over the existing, just extend it. Also, what are my options for replacing the faucet? I do not have access to the valves to replace the whole thing, so I think this somewhat limits me to what I can do. When I bought the place, I replaced the spigot, knob, round plate behind the knob, shower arm and head. So everything visible was new, and the valves work fine. But I just replaced it with the same Price Pfister replacement parts. Are there different designs/styles I can use, or am I basically stuck with this? Keep in mind this is original and 25 years old. Also, I will eventually be replacing the vanity, top, and faucet. I would like for the bath and sink faucets to match, but don't want a chrome sink faucet. Is there any hope here? Thanks!!!