I'm currently working on the Aviomodelli cessna cardinal (83inch wingspan). definitely more work than your average arf. The Fuse is duraflex plastic, the wings are balsa sheeted foam and then Gel coated. The tail feathers are foan, and covered with what looks like cardboard. I e-mailed Mantua and asked them what this covering was. They informed me that the so called cardboard on the tail feathers is something called " Mantupoxy", they insist that it will stand up to heat, and is fuel proof. I'm not so sure, so I plan on covering the wings and tail feathers with Ultracoat. motor is a ST G90. Should be a nice plane when it's finished.