I am looking at doing an RS2000 Conversion on my van which will cover alot of what you are looking to do. You would need an RS2000 wiring loom and ecu with the only modification being splicing in the rear clusters. Everything else is plug and play pretty much. Not sure about the heated screen and electric seats though as I don't think these were standard on the RS2000. It is a fairly straightforward job. Regards. Chris