I vote keep as is. But if you do go the prerunner route, go with the bumper from #1 and the fenders from #2. If you're doing prerunner, you gotta have the fiberglass bedsides. Thats just my opinion anyways. Either way, it'll be sick.
I think what you need to do is keep the truck body as is, and just make your suspension a pre-runner, aka MID/LONG TRAVEL!!!! Suck it up and do it MEOW!