My "new" 1978 Mainship is insured with BoatUS. They let me do my own survey and had me submit pictures of all areas. I did the needed repairs prior to taking the pictures. I made the repairs and am happy with both the price of the insurance, the agreed upon value, the price I paid for the boat and their survey policy. They may have been comfortable with me because I didnt try to "skinny" down the policy. I bought full coverage.
Similar here... except I did hire a knowledgeable surveyor to do the ins survey, after I'd gotten the boat up to snuff.
Taint nothing wrong with full ins. coverage and a well written policy. If you take the dollars spent annually and amortized it over a length of time in regard to the what-if-that ever happened safety factor of having full coverage. Well, you get my drift!!