I have done both. American Auto Wire (AAW) and My own. I had the advantage of the very nice AAW Diagram sheets to look at and had done it with kits several times. I bought a fuse box from a 80's Chevy truck for $15. Took at lot of time figuring out all the circuits and which ones to use and which to abandon on that fuse box. I purchased the Packard connectors, contacts and 6 colors of automotive wire online. Had a marker machine that spit out adhesive backed tabs. Had left over terminals, Had to also buy wire ties, loom and loom clamps, fusible links, 8 and 10 ga wire, grounding braid, ford relay, Ign SW, headlight sw, alternator boot and connector. For the tools: I already had sleeving and heat gun, wire stripers, soldering iron, etc. It came out really nice and I was proud. These old trucks are not complicated to wire but: doing it all from scratch, gathering/buying all the parts, "splicing" into turn sig sw, making sure you have good light sockets and so on is kind of rewarding and kind of not. I saved a lot of money over a AAW Classic Kit but same price as the lower priced kits mentioned. But these are apples and oranges Kits regarding the amount of extras. If you are really the kind of guy who wants to do it yourself to learn and assemble the stuff, are good online, can read a schematic, can plan, figure and execute, then go ahead and do it. It will be great fun, But not sure how much $$ you will save. A little for sure and maybe a lot depending on what you and your truck already have regarding good electrical parts and tools.
These are Pix of DIY Harness:
As Received Fuse BoxStart Building Your HarnessInstall and ReconnoiterMount an Adaptor Plate to Longer Hood Hinge Bolts Don't Forget the Gauges
