RE: 50CC REVOLVER!!
Couple more pics
The electronics deck and fuel deck are pretty open, but made of good plywood with lightening holes; plenty of places for attachments, etc
Spar tubes are carbon fiber.
The plane is big - perceptibly bigger than many 50cc aerobats - which may account for some of the weight. The aft of this plane has a lot of plywood, so there is servo mounting flexibilty, but again, some weight. I did not probe around the tail gear mounting area, which was soft balsa on the R70.