Just for fun I'll tell you all about my funniest mistake.
First kit, 40 size ultra sport. My wife, being very supportive would come out to the garage once in awhile to see how it was coming. The concrete floor being the largest flat place to use when it came time to join the wings was great. I was able to square up the halfs, set one panel flat, prop up the other wing tip for dihederal, mixed epoxy, all went great.
My wife followed my out to the garage when it came time to check it out, and when I lifted it I realized I had not used waxed paper!
My wife "I think your going to need a bigger motor".