Welp, it won't be under $300, that's for sure.
Bought new front calipers ($30), screws for the carbs ($5).
The black wheels I bought aren't going to work, so I'm looking for a deal on either used Katana wheels, or I'm going to have to figure something out. I may just make something to use the original rear wheel and install the sprocket directly to the wheel, without the cush drive. (Who the hell needs a cush, anyway?)
So far, I've got $140 into it.
I swapped the old frame for the new one, now I'm starting to put it back together.
Progress pic:
OH - I sold the pegs for $30... so I'm back down to $110 invested. W00t!