RE: rivet patterns
one inexpensive way is to get the book from Squadron/Signals here is the link
[link=http://www.hobbylinc.com/htm/ssp/ssp1208.htm]click here[/link]
Now, if you want to spent a little more go to a Copy-Shop and blow up the 3 draftings. Here in the background you see that on my tool box. I have two blowup drawings and they are very detailed - you don't miss anything
hope this helps
Happy landings
G-Pete