Hey Steve, I think I read everything wrong man. You have already had the latest engine change job done, and that was four years ago right? I had assumed that you were sweating an engine change right now. That’s why I was trying to help you think about some other options to get your truck going again. With the truck being full size and with the extra cab, I thought (wrongly) that you had a V8 in your truck.
I certainly think you should keep the idea alive about a multi-motherboard enclosure or multiple towers in a large, well ventilated cabinet. Having a need is what drives invention right? 
I think re-purposing existing equipment is just as important, and maybe more valuable (to me) than merely smashing and recycling the equipment for a few bucks.