I pulled this "Price is $30US including postage to US and Canada, Send check or money order to Clay Spencer, 73 Penniston Pvt. Drive, Somerville, AL 35670. E-mail: email@example.com firstname.lastname@example.org for info or call my cell 256-558-3658. Or send Paypal for $30 to email@example.com (firstname.lastname@example.org is my Paypal address but does not work for e-mail.)" off the Salt Fork Craftsmen page Saltfork Craftsmen Tailgate online Market place
The tire drive is the critical part, it can be adapted to a number of designs. I prefer one that puts the tire and motor down near the floor. It makes for a more stable machine.
Do a search for
Ray Clontz Tire Hammer Plans by Clay Spencer
and you will get a bunch of hits, which include some good pictures, or message me direct and we can talk about design ideas.