Here's some more advice - also in the FWIW Dept - based upon my experience - just buy the Skyview new install package from Vans. Rip out all (or almost all) of the existing fuselage wiring. You can pull all that stuff out in just a few hours at most. Run the new wires in - pulling them will also be a quick job. Don't worry about converting existing wires, pulling out a few surplus wires, pulling in some new wires, capping some other wires, pinouts on conversion harnesses etc. Your new straight Skyview harnesses will fit much more neatly than using the conversion harnesses, and will have the right wires, of the right length (you wind up with a lot of excess wire that needs to be tied up and found a home for.) I also think Vans should have also pulled some of the wires (like to the ADAHRS location,) out of the ship, instead of leaving them in place and capping. (I'm pulling them out.)
Then take your D-180 components and sell them on ebay or wherever. There are a lot of other airplane types that use it, and many are not candidates for the 10 inch SV conversion. You should get a reasonable amount and it will defray the new SV acquisition cost.
Vans did a great job, and expended a lot of time and effort (causing a lot of builder impatience and exasperation) to create a monumental package of New Install, Conversion from a wired up but not installed D-180 system, or Conversion from an existing D-180 system. They had the builders in mind, bless them, not wanting to say "Rip out all your stuff and start over." But I think it might have been better, faster, cheaper to have done just that. I know - hindsight is 20/20.
Bob Bogash
N737G