Hey Bud, When I first saw your frame I thought, sand blast and powder coat. After seeing 48Robs hit I have changed my mind and agree with him. With all you would need to spend to make the used trailer frame sound you could probably build new. You won't have to convert someone else's idea into your TD dream. Cheap, fast, run it till it blows is another reasonable thought.
Welcome, have fun, and pictures goood.
Enjoy, Chris