I know someone that is selling a 80% complete sig hog bipe kit. He purchased it back in the early 80's. Any ideas on the cost? Was there any problems with the kits back then. It looks good from what I see, but with a kit that old, I didn't know if there were any desing issues etc. It has a 54 in top wing span and is supposed to be fitted with a 60 size 2 stroke.