Invasion map help

I would like some suggestions/help for creating invasion maps on the following: Countdown and Powerhouse.

Some suggestions for Countdown:

Make the Sabre the target of the Invasion.
Spawn the invaders on the outside.

Some suggestions for Countdown:

Make the Sabre the target of the Invasion.
Spawn the invaders on the outside.
Force the invaders to go down the ramps on the side…

Suggestions for Powerhouse:
Make the FAREST building/structure the target
Construct a barrier to only 1-3 entrances for the invaders to try to get through
Set up an armory for the defending team
Make it look like the invading team dropped down in a drop pod or something like that
Make sure the target is well barricaded and not defenseless
Make an armory for the invading team as well, but don’t overdo the guns or the game won’t be balenced
That’s all the ideas I have right now.