Just about to order the tail kit for a 4. I live in Southeast, KS, and am looking for local Rv-ers. I have helped build a 6, a 7, and an 8. I have spent years studying Van's, and just recently decided to build a 4, vs an 8. I wish there was a quickbuild wing for the 4, but it looks like a slowbuild all the way. Anybody out there?