Come on. I could ebay it for 300!
300 dollars seems to be the going price for a maxi N frame. i've seen them go for that painted or powdered on here. i saw a complete non-op minus the engine go for that.
however, what you have is a worthless hunk of metal. you should sell it to the guy for 20 dollars. he is being generous. that POS that you created will take a bit of work to get right.