So I went ahead and drew renditions of E1M1 (Hangar) and E1M8 (Phobos Anamoly), given the 20x80 constraints. I think they turned out fairly well, but the star for E1M8 was a little tricky, and could probably be improved. Nevertheless, here are the links to the two of them:
E1M1_ASCII.txtE1M8_ASCII.txtI've only done these two so far to get feedback from everybody else as to how this should proceed. These are the smallest maps of the episode and both are relatively straightforward. I'd also like input as to how the bigger, more complicated maps (E1M2, E1M4, E1M5, E1M7) should be tackled: trying to cram them down into 20x80 and probably cutting some sections; or creating separate sub-maps that would link in sequence, with the "exit" of one map being the location of a keycard or something, and continuing on the other side of the corresponding door with the next map until the exit is reached; or something else entirely.
Just for reference, the "<" on the map is the start point, and the ">" is obviously the exit. I haven't added barrels, enemies, or anything of the sort because I don't know if they would be randomly generated like the rest of DoomRL, or if they would be set monsters like the ones in the special levels.