PS...found a copy of the basic frame plan. This has been modified a bit so I could install a drop down mount for my (big/heavy) spare tire.
And here is the spare carrier and chain hoist. It came off something like an older Toyota and cranks up or down using a wrench I modified to fit.
The gray primered tube is the front most element of the deck. The rear edge of the deck lines up with the back of the tire mount frame.