I have a 1929 cast iron bathtub. The edge of the tub is rounded somewhat (it's not as extreme as a roll-top tub). The wall surrounding the tub is tile. Can I install a shower door? My concern is that the bottom track won't fit snugly against the edge of the tub?
Probably, but you might have to go with a custom one. The bottom on most of them doesn't really support anything, it just keeps the doors aligned and water from getting out from underneath (they're attached to the walls and the top is supported by those uprights). All of those I've looked at expect a flat bottom track, though. With a custom one (and maybe others, I don't know), you might be able to get by with a plastic sweep on the bottom, rather than a track plus maybe some guides. Be interesting if any of the pros have some suggestions.
Important note - I'm not a pro
Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013