The easiest way to save bulk $ on a paint job is to buy a straight, rust free car in the first place. That is why I pointed you to that WB. Hierachy of choices is:

1. Buy a rust free, straight car.
2. Buy a rust free car with dents.
3. Buy a straight car with rusty panels and replace panels.
4. Buy a straight rusty car, replace rusty panels and repair body.
5. As above but dented also.

You'll save 40% on a paint job if you buy no.1. So drop from $10,000 to $6,000 (this is for a quality 2 pack paint job, not show quality).

If you paint strip it yourself you might say another $1,000.

These are just random numbers, so can vary wildly depending upon multiple factors. What i'm trying to convey is buy the right car first, not the cheapest or the most pretty/shiny. That WB appeared to be a 1.5 - it had a few marks here and there like the bodgy tail-gate locks.