One gotcha when doing final assembly on the bulkheads…I found that when I drilled the spacer bolt holes out to 0.25″, there must have been some chips generated by the drill that scored the sides of the hole. This is in the heavy bar that forms part of the rear wing carrythrough bulkhead, so I was somewhat concerned – don’t want any crack initiators in a part of primary structure.
I spoke with my Tech Counselor, and sent pictures to Vans tech support and engineeirng (note from the future – I also talked with Ken Kruger, Vans Chief Engineer, at Oshkosh 2010) – all said that there are no issues because there are essentially no loads on these spacer bolts. They’re there only to hold the spacer in place.