Hm. That was an easy but fun challenge. My solution was *very* slightly different to Fernito's, not different enough to warrant a seperate replay.
minimac: I'll try yours now.
EDIT: Tried it... and very much topped it. 100% with 1 blocker, 3 builders, 1 basher. Or alternatively, 96% with 1 blocker, 2 builders, 1 basher.