I have the super skybolt ARF. I have the OS 91 four stroke in it and opjose stated everything correct. The fire wall on mine started to get loose and I never had any hard landings with it, but a very easy fix to beef that area up. Which I did and have never had another problem. I think I may have three or four gallons of fuel thru it now.
The covering it real good, or was on mine, just be carefull around the checkered area because they seem to be removed real easy if not careful.
Mine did come out tail heavy, but I did add a smoke system. The build was very easy and went togather great. I think anyone who gets a skybolt will love it. I know I do mine and if mine should have a mishap I will replace it in a second.