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Richard,
I am building a Fokker Dr1 triplane. Yes, most builders use 4130 steel. Yes, we use 1/16th birch ply for the rib webs. I also use a tailwheel, brakes, and a standard stick grip instead of the ram horn grips used on the tripe and the D-7. There just isn't enough room in the cockpit for that thing.
Hope that helps.
Herr Grube
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