The custom game Castle Wars inspired me to use the multi-flag capture the flag gametype.
It has the same concept but instead of energy swords, everyone has snipers. Each team has their own base each with three floors(Symmetrical reflection-wise). Each base has a two way teleporter to the center bridge. I tried to make it so that if someone's camping on or around a teleporter that you can always see them from the opposite teleporter. There is also a 30 second active camo near each of the bases teleporters. Respawn time is 10 seconds. Flag carrier has poor camo and is immune to headshots. The custom power-up in the center is basically 110% damage, damage resistance, sheilds, poor camo, etc... Game is 20 minutes long or until 3 flags are captured. Flag must be at base to score. Flag return time is 1 minute or 15 sec if the team returns it. After playing the map several times I found the best strategy is to have a few people to go after the flag and the others protect you from a distance.
Enjoy...

Map Overview

Main Spawn Area

Ground Floor

Second Floor

Top Floor and Flag

View from Top Floor to other Base

Center Bridge

Castle Structure

Additional Shots:

Close Range