Good layout. I like it.
As for the paint, I personally do not like using paint on fiberglass, it will not stick that well. However your not going to have a big enough motor on it that it will become a real issue. There are several different types of epoxy paints that you could apply and they would adhear very well. Plus the epoxy paints would make it very strong. Most regular paints will not hold up under the pressure of the water while underway and they wear off very fast when being loaded and unloaded on the trailer. Any small bumps into logs or docks will usually chip or crack regular paint and that will allow it to flake off.
Most boats have Gelcoat, but you probably do not want to spend the money and even more time to prep and spray and then wet sand and buff gelcoat to make it look like a new boat. You could use a paint roller and roll the inside and get a non skid finish. That would make it less slick and still functional.
You could probably do that with the epoxy too. Make sure that you have the deck up front braced well. You can glass in any additional braces needed for the front deck. Start with your sanding and check all the wood and make sure it is not rotten. Now would be the time to replace it. Keep us updated and I will continue to give pointers as needed. Feel free to ask any more questions you have.