Be careful with Progressive and make sure to read the fine print in the
contract with whoever you go with. Look for exclusions about pre-existing conditions, limits of value, etc.
Couple of years ago I spoke to Progressive while looking for an "agreed value" policy for a collectible car. Collectible being a sore point, some insurers will only class Detroit products as collectible, others require "show and display" use only with a second car on the road as a daily driver...everyone has a catch.
Progressive? The nice rep finally confessed, their 'agreed value' policy, which is
sold on the basis of a mutually agreed calue for the vehicle, would actually read "agreed value or market value, whichever is less..." and open up the whole can of worms as to what the value would be. Which defeats the entire point of agreed value coverage, especially since you have PAID based on that value.
Also beware, if you pay $5000 and put two hundred hours and another $5000 worth of material into the boat...it will still be worth only $5000 until everything is done and another survey and reinsurance happens. There's a big coverage gap where all your labor is worthless until proven otherwise.