Ranger, that looks great!!
I think all three TT bases should be uncappable (assuming HTC allows it), and perhaps located
in the city, or at least
right on the outskirts (or have all the spawns lead into the city).
Also, I'd be HUGELY in favour of a TT that consisted of a central city, with each base directly on the rim of that city. Then have objects arranged around that base so that ALL GVs would be forced to do literally street-to-street fighting.
By doing that, teamwork would become essential, and the gameplay would be ultra-intense!
EDIT:
Maybe try to force the fight into the town. Also try to make it where there are no spawn campers. just thinking out loud
This sounds brilliant. Perhaps have the spawns at dead-end streets, where spawn campers would have to camp out in front of spawning tanks, and thus wouldn't last too long

.