I made a little progress. I ordered a bunch of stuff in the last month. I got some shocks from Speedway, Buss fuse panels from eBay, 500 feet of wire, a flex-a-lite fan controller from eBay, and a small haul from the nearest junk yard.
I ran across another mail jeep, and the headlight holders were exactly what I needed. They were $10 each, I grabbed some halogen H4 bulbs out of a land rover, a water pump pulley just because it was there, a big handful of fuses, and 31 various relays. Volvos have Hella brand relays, I found a Bosch in a Toyota, but it only had one. The Nissans had a bunch of relays, so I mostly got those. They're SPST, SPDT, DPST, and DPDT. Then I grabbed a wiper switch for my car for $16, and found out it was the wrong one.
Total without the wiper switch: $32.
Those brackets on the headlights are 9 inches across. The buckets they're going in are 10". It should be a piece of cake.