Plans are not specific on how many rivets are needed for the cabin frame support. Maximum spacing is 1 1/2" between rivets. Counting the CAD drawings there were 19 on each side. I made it an even 20 on each side which worked about 1 3/8" between rivet holes. First time use of my fan spacer which made the distance between each rivet easy to determine. Marked edge distance and rivet spacing on the flat bar stock and then back drilled with a 1/8" right angle close space drill. Used two cleco clamps between each rivet to make sure the assembly was tight and worked both sides until they were all set.
