Punish him?
Its identical to the other 4 sitting on the flight line.
Ohh yes.
If it's a decent plane and you're willing to drop a few $$$ on getting revenge... buy the same model! Keep it in your car under a tarp, then when mr. braggard shows up with his scratch built scale masterpiece, put your plane next to his on the flight line. That should suitably embarass him, without a single spoken word
Then flog it on eBay to recoup some of your money.