Yep, my k5 is gloss black frame. They had a bunch of rubber cones stuck in every hole, but still had to work at it to re-assemble. For the most part, I just needed to clean-up the first turn or two of threads. Just have to take your time and look at everything, I used bolts to tap it back out, where I could. Not going to work tho, if you have alot in there. Tap and Die is definately the right way. My two cents, is get some new bolts. I found boxes of metric boots at the bike shop for cheap. The new powder coat will make old bolts look older. On my bike, the little bit of powder coat that was in the first thread or two, acted like loc-tite, so it kinda helped. I just was very careful not to force them. You could always use something that is extra part (or metric nut that works on spefic bolt)to test tap. Of course you have the bolts you pulled out to compare to. Anything like sand paper or utilty knife to clean out fitment areas depending on how thick it is. You'll appreciate the durability of that stuff before you're done, thats for sure.
That thing should be showroom now huh? Powder-coated, Stewart-built, green-machine. (black now) where's the pics?