Excellent advice TC.
If money is an issue ( not being able to tear it down a put it right back together), I like to start with the wheels and brakes. Inspecting and replacing whats neccessary as I go. Packing wheel bearings and replacing all seals is also done. Once all four corners of the vehicle are good and solid move on to the steering components. In this area I replace all the ball joints and tie rod ends followed by a front end alignment by a shop or garage.
Once it rolls, steers and stops, you can go two different routes.
1. Engine, then body.
2. Body, then engine.
I prefer to make the engine/ exhaust problem free but not nice looking ( or finished to say). After every thing is sound, this when the body and paint get done. Only because dust, dirt and over spray get on everything. Once body and paint are complete but not assembled, pull the engine and transmission going through them rebuilding or replacing. When the truck is back together with the finished engine/ transmission and transfer, install the rest of the body panels and moldings.
The interior is done next, some parts can be installed any time during the build but I like to leave the finishing pieces last ( dash pad, door panels, etc).
When all is complete, wet sand the body and buff.