I had no problems putting mine together, used all the stock parts used a Saito .56 w/12x6 prop and the thing has unlimited vertical, does knife edge loops and does touch and go loops like one of my fun flies. I mixed elevator to flaps for tighter loops. I've pulled some high G stuff that I pucker through but so far it's held together, I have a couple of gallons through it since I got it early january. Everyone is amazed at how it flies.....