Looks like no one has any pointers so I'd say just use your own common sense.  I'd like to have an aluminum boat but I'm restoring a fiberglass Chris Craft instead.  I use a pressure washer to clean the outside of my boat.  It still doesnt come completely clean in some areas but all the topside of my boat has been painted over the gelcoat and I have redone much of that paint, plan to redo it all.  My hull buffed out pretty nicely except along the waterline where I will have to wetsand and later pull the boat for new bottom paint.  I had no room or need in my walls for insulation but I've seen discussion on sites mainly advocate the solid sheet type insulation, definitely avoid foam.  Good luck, I'm sure your boat will come out great when done!