Yeah, the real travesty is that ctf_2fort_revamp is so far down the list
(And ctf_2fort_classic_v1 doesn't seem to be based on the SDK copy.)
I'm one of those folks who started mapping based on the sdk_* maps. And frankly, I'd do it again, and I plan to continue my ongoing map in addition to the my new one.
For me, it's a practice in map revision. With a map people already have a lot of strong pro/con opinions about, can I accurately diagnose the problems and work in solutions that don't involve moving huge tracts of geometry?
That said, if you want to change the overall map geometry to match TFCs, my suggestion is to start from scratch: Stock 2fort has so many brushes you'll have to move...