Dave,

I personally wouldn't build the EAA. Just my opinion.

If "flying" and participation in General Aviation, is your interest, I would make friends in General Aviation. Those that have a pilot licenses and or airplanes.

My goal would be to build air time and possibly buy into an airplane Club. That is four or five owners of the same airplane. Keeps the price down.

I did this in the early 80's.

Eventually, I purchased a Lake LA4-200T. This is actually a STOL aircraft. I put almost 400 hours in it before I sold it. 377 to be exact.

About your build? I don't believe you will get your STOL performance from a bi-plane. The aspect ratio isn't working for you.

Research aircraft with STOL abilities. I believe you will find single wing aircraft with high aspect ratios.
Keep us informed.

Charles