I'm considering modifying a foam glider into an RC plane, but one of the problems I'm worried about is that all the electronics will be sitting rather exposed on top of the fuselage(I think that's the right term for the long skinny tube part). So I figured 'oh I'll just cut out some holes and set the stuff in there' but I don't know how I would cut the channels and holes for wires and hardware and leave a floor for it to sit on. If needed I can cut all the way through, chop off the top bit or so, and then duct tape the bottom part back into the plane to make an indent. But this method still needs a knife or something to go all the way through the foam, and I know that's not gonna happen without seriously mangling the plane and wasting foam. I looked into hot wire cutters, but for that I would have to cut from the outside of the plane and that would weaken the plane overall.
How can I cut through up to 4 inches of foam while minimizing the amount that turns into that annoying fluffy snow stuff that gets everywhere?