hm. for 50 pts, the zerglings r kinda weak. IMO. it costs 200 pts for 16, and that would make a decent zerg rush.
I've been toying with StarScape ideas for the past couple years, and have always come back to making it somewhat like the Marro, where Zerg have the Lair, Terran Barracks/Factory, and Protoss Gateway/Starport... (I'm totally blanking on the Protoss' ship structure's name is...)
Then have zerg cheap, terran in the middle, and protoss expensive to simulate resource cost.
Anyway, they look great, but if you are trying to make it seem like you are playing Starcraft with Heroscape rules... It seems more like the army was just planted there than built.
But good customs. And I love Starcraft! 