Heh, actually, I've never realized I have some quite peculiar associations with particular games, but turns out my mind does go as follows:
Doom mod for
Wolfenstein 3-D? Cool.
ROTT remake on the
Doom engine? Cool.
Doom mod for
ROTT? Weird.
But of course, somewhere deep in my mind there's also a thought that you could do any of the above games using the Build engine
On another note (speaking of the secret
Wolf 3-D levels in
Doom II, I've always thought that it could've been quite nice for
Duke Nukem 3D to have secret levels that are tribute to either
ROTT or
Blake Stone. I'm sure a
Blake Stone level recreation with Pig Cops instead of "Rent-a-Cop" security guards wouldn't be out of place
Oh, and I also would like to stress that even though I've used the phrase "less advanced engine" in a previous post when referring to a possible
Doom to
ROTT TC, I do not actually view the
ROTT engine as less advanced, it's just different, and because of that some things that you can do with id Tech 1 cannot be replicated in
ROTT. For example, levels that have both indoor and outdoor areas, although indoor areas can be "simulated" on an outdoor map with either very high walls so that the ceiling (or rather, its absence) is never in the player's view, or with the catwalks, although I think they also have some placement limitations (I don't remember catwalks that would be more than one tile wide, although I'm not 100% sure on this).
BTW, another random thought: do you know if the engine used in
ShadowCaster is the same thing as the
ROTT engine, or is it different? I remember there's stuff like underwater areas with a similar principle as in
Duke Nukem 3D, and it generally feels pretty advanced for its time.