RE: help with engine size
Maybe a DA 100 but no way on the 150.
Guys at our field have a 52% Model 12 Pitts that weighs 51 pounds with a DA 150 and it flys great. It lacks a little power for hovering (engine is brand new)but will do basically anything else. Personally I think it has the wrong prop on it and if they changed props it would hover fine.