By the welding on the chain case this isn't your first time with a wire feed. Great job ! I bought a new old stock Finn 80" model ( used for 2 acres of sand soil by a lake ). The only mod I have to make is it is fixed at 15 degrees to the left by the hitch design. I'm going to remodel it to swival with a hydraulic ram. These machines are so great to straighten out humps, hills, windrow rocks, ect. I am going to build my own version of the Harley later on which would be the same as yours.... only a 7' width.
Do you have an album of other projects you made? Thanks for the pictures.