I think a better starting off point like an M6, or a quad Nage, or the quad handle Review: Quad XML2 Flooder [Similar design as a UF-T90], E-Switch in Handle (4x XML2, 1 - 4x 18650) would be better. That way all that needs to be upgraded would be the emitter, mcpcb, and driver.
Would still probably be $50+ though.