RE: Sig 1/3 scale Spacewalker
You are making some good progress. I like seeing the use of mylar hinge material to reinforce glued joints. Tom Crump even spliced some plywood on the inside of the fuselage to reinforce the splice between the front and rear fuselage sections. I am looking at the pictures and trying to figure out how I can install my Zenoah engine two top mounting bolts after the front sheeting is added. They will have to go in from the back because the mounting cup behind the motor is drilled & tapped for 1//4 - 20 screws. There may have to be a hatch installed that could even be used to place the ignition battery in if the plane ends up tail heavy as I think it will. You are doing very nice job on the build.
Joe