Phase 1 - build all of pin 1 and 2, for pin 3 build buff beam, shroom pit, and auras. (I Just used my dps to watch pin 3 and upgraded all buff beams for first wave.)
Phase 2 - Finish build then summon 2 of any splits with a huntress guardian pet each on pin 1 and 2.
Boss phase - Use a TB monk who sits behind the towers and any other split you'd like.
DPS is optional for boss, the towers easily kill him, but you can use one if you'd like.