I have been building rcpowers planes with foam board since he started his channel and they fly great, the foam board is actually very strong with the paper on it and you can take paper off on side and mold it very well, I use flite test foam board so I don't have to use minwax to seal the paper. I use a 2200 mah battery and a super mega jet v2 motor from grayson hobby with a 50 amp esc, only two servos, 2 or 4 controls surfaces, that keeps it light weight.
Looks good! Sometimes I wonder what with how much easier it is to get hold of cheap paper backed foamboard if this style of modeling is going to become more prevalent. The paper, though it certainly has weight penalties, does make it easier to mold foam to any given shape, especially smaller radii.