[LONGHAIR]

Since I have no idea what the labor rates are in your area, over-all cost would be hard to say.
But as usual with me, that doesn't mean that there is nothing to say.

First, it's a big job, so it is going to cost. The best thing to do is get the most for your money.
Don't "service/overhaul" anything. Replace things like calipers, wheel cylinders, etc. Get a complete hardware kit for the rear. You get new adjusters and this replaces worn springs.
On a half ton truck, it is probably more cost effective to replace the drums. On a full floating 3/4 ton, turning may be better, if possible.

Parts like these are relatively cheap, labor on the other hand rarely is...
It is far faster to replace, which translates to less labor. The total cost may or may not change, but it is all new parts. You don't have bleeder-screw rust issues, etc... Same with adjuster screws. Break an old brake spring a few months after a major overhaul....you would be upset.
Wheel bearings might be an exception. The labor is pretty much the same either way, so if they are good, they are good. Replace them if they are worn.
Since you are doing everything from the master cylinder down, I would replace the rubber hoses too. They deteriorate from the inside to, so outer inspection is not all of the answer.
If you are doing a "super economy" job (and doing it yourself) you might "service" some of these things, because it is your time. Since you are paying, get the most for your money.