another lead from the Jeep show this weekend that i picked up was a guy who does CUSTOM wiring harnesses. his current ones are centered around the 5.7/6.1 Hemi's... but I did talk to him about a cummins' harness (both 4bbt and 6bbt)... as well as a custom body/cab harness in both 12v and 24v.
not sure on cost yet... and what he would need from "us" would be a detailed wiring diagram as well as dimensions of the truck for lengths of wire.
oh yeah... and i talked to a guy that does custom dash's too. hahaha. it was a busty weekend