That much repair/redo will make your boat worth less. Does it really need paint? The white hulls look really good after a little acid wash and a polishing. Grinding off the nonskid pattern and applying something new will make your boat less valuable. You should really limit walking on the deck of any sandwich foam built boat, so adding really good nonskid and then painting it will just encourage you to walk on the deck and destroy all the work and $ you have just put into your older boat. There are easier and cheaper ways to fix the delam. Spend your time sailing, and money on really important stuff like new sails...