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Help! FTFC20 Classic to Modern Forum Challenge!

I am considering entering the
FTFC20 Classic to Modern Forum Challenge!
But I am not sure I could complete all the requirements on time and am playing with having plans for traditional foamboard construction and separate plans for a mix of foamboard and 3D printed parts.
Here are some beta parts I printed for a proof of concept.


It is a large plane as you might guess from the pics. What are the restrictions on what materials can be used?