So first, nice skills--that is a slick lander.
Second, while someone might buy this one off you, good luck getting repeat business from anyone with half a brain if you go outing shit like that.
While I don't know what kind of contract you had in place (if he was from India, it probably doesn't matter), but anybody in the US with experience would likely have terms around work made for hire and unless you had language specifically around what happens if they don't pay and who owns what, you could easily find yourself in deep legal shit. So be smart, and don't do something stupid like this again.
But again, nice fucking lander. I'll be sure to poach some of those design elements for my next one.