Some pic's of my 77oz, 80" glow powered foamy, OS .40LA engine, the foam is 1/2" pink, i used some 3/8" thick wood for the engine mount, cut some slots on the tablesaw and epoxied in some 1/8" wood for spars and the sheet veneer is some 1/32" stuff from work. For finishing i always use 2 coats of Varathane diamond polyurathane ( water based ) and then just use a regular spray bomb to paint it.
The 80" build convinced me to do the 120" 10lb (fully fueled) .46 powered 1" blue foamy B2
http://www.rcuvideos.com/video/10FootB22-wmv