This is an... impressive amount of work to repair an exhaust. Having recently replaced stolen cats on a similar truck, I can attest to the fact that Toyota exhaust leaves a lot to be desired as far as repairs are concerned. I'd never have gone as far as you have, but as a fellow cheapskate (no offense) I must say hats off for the effort.
I just installed a muffler on my '00 Grand Cherokee, which couldn't have been easier. The factory exhaust is about at simple as it gets: Y-pipe off the manifolds, followed by a straight shot into the cat. Same for the outlet: straight shot into the (now new) muffler which then connects to the over-axle pipe and finally the tail pipe. I was able to remove the OE muffler and install the replacement/pipe extension in about 45 minutes. That includes the MN rust factor.