I defend on that map any day, its easy.
Not eaven a bloob of vet 3 (!) Panzgren could get thro.
Fix bottom, its stupid that you need to blow up the doors to get in, nice Idea but it don't work.
I haven't played the map yet, but watched some replays, and i think it is balanced, although one side can reach the town faster.
And the bottom is something new, i like that, it encourages the people to use their brainz and deform the environment to their use.