K&P first. Since I'll have to do some tinkering to find the best place for the relay (I'm 100% confident it can be done, since if nothing else I can put it in the hopper... But I'd rather keep it compatible with the ones I've done before, so hopefully it'll still fit in the marker...)
Sonic frame keeps the same internal dimensions as the stock frame, so that's no problem at all
Email me for pricing, I don't like qouting specific package pricing and such online. Also, you may want to wait until it's in progress; I have sale prices pretty often, and if I find lower prices from suppliers, or find a need to use a more expensive part, prices may change... Probably not a lot, but some.