Actually, given the accuracy of laser cutting, and some of the RC airplanes I have seen, I dare say that the build was probably almost literally a matter of minutes to assemble. Tab and slot assembly garauntees alignment, and it would go together pretty fast. My only concern would be with all the joints and vibration.. however with enough glue edge the stress would be distributed well and that may not be that much of a concern,,,
as to the fuse,, as long as it is 3/4" at the flap hingeline, its a legal profile,, doublers and such are allowed,, oh and the engine exposed from the mounting lugs to the head,,