Here is another map i made called warbound. Its a symmetrical map made for team slayer in mind as well as CTF and also supports up to 16 players ideally made for 8 though. video link below Halo 4 forge map: warbound - YouTube red base red sniper middle map overveiw
Don't see how this would work for CTF. You would basically have to have the entire enemy team waiting to spawn to effectively steal the flag since there will be no sneaking around enemy lines. Is this your intent?
I never planned on having CTF originally something i just added for fun in a way because i wanted to see how it would play out.