That doesn't sound like an automobile....
Maybe you could replace sections with thick aluminium sheet
to make holes in plastic, if you have a motor tool, grind away from the inside and when it's really thin, use a hobby knife to rough up the edges and apply paint. be careful it doesn't melt.
This car i replaced the fenders with aluminium sheet (thicker than alu-foil), i pressed the foil over the kit part to get the shape, then back filled with epoxy to hold it's shape. the hood was just melted, but it doesn't look like damaged metal, so don't do it that way.