I think using the single train line and containers to mimick the original Well is very, very cool. Same zig zagging patterns, a bit more to look out for, and it's great fun to use the timing of the train to your advantage in mid-map confrontations.
I however, do not understand why there cannot be true sewer entrance to the flag room, and why the they took the "majesty" away from the flagroom by removing the tower and bridge.
Much can be improved concerning the flagroom, but I like it MUCH more than the CP Well... which should never have been made in the first place before they properly ported over the CTF version.
Either way, it's hard to say what problems they ran into, or how much it may have resembled 2Fort's sewers, etc.