Hey Juan whats a good tool kit as opposed to minimum Ive got all that stuff
Ok, for case finishing get a pillar drill or a drill press that you can fix your drill to. Then get yourself a cone cutter. The time saved with one of these and the holes it can cut are worth it's weight in gold. I use automotive primer/paint/lacquer, it seems tougher and dries quicker.
As for the assembly. I use fairly pikey stuff to be honest and you could get a good regulated soldering iron and a proper heated solder sucker (another essential tool, especially if you plan to scavenge parts or make a mistake). As I say I use an old 15w iron and a manual solder sucker. Flasher stuff would make it easier, but as long as it works, I struggle to see why I would change.
Other bits would be a hacksaw and file for cutting down pot shafts and cutting up vero. Some sort of tool as a track cutter if you are going to use vero (what I use is pretty much a drill bit with a handle on it). A really good pair of glasses or a magnifying glass if you're going blind like me. Get a good multimeter, they're invaluable. Make a signal tester (out of an old guitar lead and a cap), awesome for fault finding. If you're being tarty get some heatshrink and a little blow torch type thing to shrink it. Bag a reel of solid core cable, you won't believe how much easier it will make your life. Otherwise, honestly, there's not much more to it.