Installed 40 nutplates in 5 access holes on bottom wing skins. Had done 1 access hole previously while the skin was off but decided it would be easier to do with the skins riveted on. Got fuselage aligned with garage, prepared the wings spars as indicated in the plans by scotchbrighting a bevel at the ends of the main spars. Found some old 5/8" head bolts and ground the threaded end to use as drift pins to attach the spars. Attached each wing spar and placed one bolt to hold it in. The wings are on!!!