Hi!

Keep it light!
When I built my Marutaka DC-3 years ago I decided to lighten it in every possible way. Because light planes always fly better (Slower, more scale like)
That meant hollowing every balsa block and replacing every heavy item with lighter ones and only using small mini servos and the lightest covering available and still be "scale like".

I decided to first cover the fuselage with 25g glass-fiber weave and 24 hour laminating epoxy to have a though surface and then sand it to a smooth finish and cover it with small strips of Oracover chrome plastic film (wet sanded on a piece of glass).

Ca glue is fine for building (use it most of the time when I build ) but would not do when covering with glass-fiber.