I just happen to be building the RV-4 myself and was looking over your fuselage. You do nice clean work but I see an error which is quite concerning, in my opinion. I see no plywood reinforcement between F-1 and F-5 as outlined on the plan by the dark triangles. This is one area where I think the extra strength is needed. Look close at the sides coming thru the front bulkhead and you will see what I mean. Good luck on the build.
Frank