Completed the center section bulkhead and really did not have any problems. The plans are pretty much clear. Drilling, drilling and drilling. Took me about 3 hours to drill and then debur all of the holes. The guide (previous post) ensured my holes were 90 deg to the angle. The plans tell you to match drill 72 holes, I counted 71 holes. We will see as we proceed. Countersunk the holes in the F-1204 center section and then dimpled the holes in F-1204D. When you countersink, follow the dimensions for the required hole width, mine could have been a bit wider. Use a Uni-bit to get a nice 1/4" hole in your sample.
Prepared and attached the skin attach flange and prepared the skin stiffener.
Riveting took a bit of time, but, no real problems. I had to measure the driven head diameter with a micrometer. All passed the Mil-spec but failed using the go/no-go gauge. The next size (length) or half size would be a better choice here.
Attached the side skins and fitted/drilled the skin stiffeners.
Time - 7 hours
