Thanks guys,
The dowels won't be feasible. The finished part is rather complex and
only 3/4" thick. It'd be very difficult to place the dowels. I'm
pretty familiar with the construction of the hotwired aircraft. The
Great Stuff might have the same rub as the poly glue. The poly glue
cuts fine but at a different rate than the blue foam. The glue is
slower so the foam melts out, has a larger kerf than the glue, so the
finished part is rather scalloped or has raised ribs which don't sand
out too well. Think of growth rings in soft wood. Keep thinking and
searching the brain cells. I appreciate all of the answers to the
question. Kevin