cheapest way to get hemi 3g going?

From what i've gathered by talking to some of the guys who have already pulled it off. You can use the factory harness, you just have to spend a lot of time adding in fuses and relays where they need to be added in order for it to work. That requires a lot of time in the manuals and figuring what needs what. That's the route I will be attempting to go since I'm getting such a good deal on the harness/ecu/fuse box/converter/driveshaft/transmission from that 05 Rumblebee. If I can get it all together I could save myself thousands on this swap all together. If you go through the threads you can find some of the people who have used it rather than buying the hotwire harness. If I ultimately fail with the harness, then that hotwire harness will be the route I'm going.