i use balsa triangle stock to reinforce the motor mount area on my foamys

one question though?

how big of a foamy are you flying that your power system requires an 12/6 prop?
i have an 45" wingspan flat foamy that i fly with an 10/3.8 slowfly prop
it has plenty of power with this setup
seems like if you have a 33-35 inch wingspan flat foamy
and your power set requires that much prop
you could benefit more from an lighter power set
you will give up some of the punch on your veriticles, but
with less weight you will find that it flys better