I've done a conversion on one of the Valve original maps for Team Fortress 2. Here is the public version, without the TOG branding on
FPS Banana called 2Fort Multipath. A bit un-imaginative, but there you go

. Although, if you decide to play on the TOG server, then its a slightly different version called TOG Fort.
here is the thread on it.
Here is a pic of the public version:
I must pay tribute to the guys & gals over on the TF2 forums, they have given me so much support and help!
There is another map in the works, original work this time, not a conversion. Its still in very early stages, and not playable yet.
Details:
Game: Team Fortress 2 (Valve)
Description: Conversion of valve's ctf_2fort into a multi path payload map. You, or your enemies for that matter, can change the carts path to the objective. Deliver the bomb cart to the Red fort command centre!
Game version: game auto updated via Valve's Steam (DRM)
Change log: well... deleted the ctf components, added payload components, broke it, fix it, did some more which broke it again. gave up, came back to it, fixed it. got help, finished it, did more to it, broke it agian, patched it up and sent it out the door!
Anything else: Its not finished yet, and just last night, after weeks of running well, the cart spazed out, Valve may have changed something... GRRRR
NAM
P.S. great idea Neddie!!