I've been trying to sell my old Grasshopper, in the FS section, but not takers. I'm thinking of restoring it as a basher for my nephews. If I do this, will need to keep costs down as I don't wish to spend a lot since a new one is so cheap. Anyway, the car currently has a GrassHopper II body. It has two cracks in the front and part of it folded under so need to build up with some filler. I would like to sand down and repaint the shell (minus the California Rasins, don't ask). I'm not going to apply any stickers, just paint, so I need to fill in the hole in the roof where the driver's head once was.
Can any of you recommend a material to build up the cracked area in the front and the screw hole on top? Please see the circled areas in the picture.