My 72 Swinger, Whats it worth?

First off, welcome to FABO.
My advice to you is to re assemble the car the best you can.
It's too bad that you cut the quarter panel off and didn't finish that side.
If you have the time, install the quarter properly on that side and get it in primer, and make it running and driveable again.
I feel it would be worth as is under $1000, and driving, about 2 grand on a good day.
I'm going out on a limb here!