I flew it today and it's a great flyer, OS 91 isn't the best choice for 3D but will hover it with the 16x4w apc but no vertical pull out have to push or pull over to get out, I'll try the 15X6 tomorrow as it was my favorite prop for the Epsilon.
Mike please step to the front of the class for your gold star, well built, much completed and a very good flyer, at a great price, KUDO'S DUDE.
I think the Webra 120 would be a great engine for it if you like 2 stroke's the Webra is an awesome engine a freind has one and we cut one side off a pitts muffler and welded a cap on the end and it runs perfect you will have a little weight gain over the OS 91 but the performance will be there.