Welcome! --- I'll double down on the Deco's being gorgeous trucks for reasons similar to Paul's.
Good news is that there were five and a half years' worth of production ('42- early '47) so parts can be surprisingly easy to find for trucks that age. I have found a ton of stuff just on Ebay alone. Also, there are lots of parts that interchange from 1/2 tons through two-tons (except COE's). As for brakes, I would immediately swap the single pot master for a double unless you are going for a museum piece. Just way too risky having all your stopping power running through a single system. Tires and wheels can be tricky but there are a couple of lengthy and very intelligent threads on the topic already here that can provide some ideas worth considering.
And tires brings up gearing. There were only two gear sets ever made for these rigs. One is a 5.43 (rare) and the other is a 6.17 (most common) as I recall. Don't figure on ever going over 45mph with either set. Maybe 50 downhill. The only options there are an axle swap, different tranny output, overdrive, 2-speed brownie, larger tires or some combination of all of the above.
Yes...they are work, but they are well worth it, at least to my mind. They are just SO damned purdy!
