I am inclined to believe the airplane will be heavy because (don't laugh) I am useing paneling to build the fuse from the turtle deck forward. The paneling will only add a few more ounces over light ply. I am building cheap so I can have fun. After reading a few post about weight I guess i may use an engine I have which is Super Tiger 51,61. All that lumber will need some power to get up to speed and the grass is pretty tall (crop duster field). Man that wing is big on the 60 so I might want to add a bomb release and take some target practice. OH YEA