ok, so i just spent from 2am - 7 am building this
There are 3 bases, but the defenders start with 2 bases, the 2 bases are symmetrical entirely, the attackers base is an open room, but next to it is a mountain from which you can camp and snipe there, although there is no cover. There are tunnels as part of the back trench...
That's the description...I hope you download, enjoy, rate
Pix:

defenders base (same on other side)

overview of map

the tunnel part of the back trench wall

attackers base

overview of map 2

Newly re-modeled Mountain

Inside Mountain *new*
There are
2 BR's
2 Snipers
1 Rocket Launcher on this map...i just spent 6 hours making this aesthetic
Trenches S39
Ok i have gone through, and altered it a lot, i will upload some new pictures soon, and it works on the following variants (or should work)
1) Capture the flag
2) Slayer
3) KOTH
4) Oddball
5) Assault
6) Infection
it also works on the team version of those
(although i'm not sure if it will work with team oddball or team KOTH)
Enjoy