An update to my laundry list, and one more Mos Eisley background craft done. We see this one for all of a few frames as Luke is hopping out his speeder to shoo away a few Jawas.
The blueprints have been available from Balantine Books since soon after the ANH came out, but the legs and engine don't feature in them. A few modifications were made before filming. Notably, the feet of this craft are tread teeth from the full scale set of the Jawa Sandcrawler. The engines look like more scrap from an aircraft junkyard, but it beats me what they're from.