First, congratulations on finding a great boat. I really love Crestliners, especially the newer, welded boats. Very tough, and arguably the best riding boats for their size and HP ratings. The fact that it will hold a 90 HP tells you something about the construction.
I really like the work you have done to the dash. Krylon Fusion is outstanding paint for plastics. I have restored a number of things, and it holds up as long as the original plastic in many cases. I built our house in 2005 and painted the green plastic shutters blue. Had a friend help power wash the house this spring, and he asked when I got the new shutters. I was confused for a sec, but when I looked carefully, yes, they DID still look new. THAT is some good rattle-can paint!
16 ounce Granite gray marine carpet is standard. Comfortable underfoot and durable, and if you keep it from cooking in the sun, it will last a long time. Even just a blue tarp goes a long way toward protecting your investment.
Do you have Amazon in NS? We took a 2-week driving trip, and crossed on the Bar Harbor/Scituate Cat ferry, and did the coast all the way up and around, and ended up back in Maine. Really beautiful place, and still one of our all-time favorite vacations.
Not sure if I can add much, as you seem to have everything in control. Very often, electrical is just a matter of replacing corroded terminals and a few switches. I often see guys make a mess of something that wasn't too bad to start with, costing them much time and money.
If you have any questions of decisions, post them up and hopefully you will be steered in the right direction.