[Bigtone]

You could paint the body and stick some self adhesive lexan behind the hole and then fill the hole with another piece of self adhesive lexan from the front. Then touch up the paint from the inside. The self adhesive lexan is available from AB Slotsport or SCD

 

[Bigtone]

Link for AB Slotsport, what you want is at the bottom of the page. http://www.abslotsport.biz/page18.html
Link for SCD http://www.abslotsport.biz/page18.html