Sorry that you aren't getting more assistance here. I just bought a P30 myself, but I'm not expert enough to answer many of your questions and I'm on Long Island, so I can't help locally.
The one thing I know a bit about is motors and Atomic 4s in particular, which is what your boat originally came with. You can find used, running Atomic 4s without much effort. Ask at boatyards, watch Craigslist, etc. Running examples can be had for well under $1K.