Try an auto upholsterer or an awning shop.
All you need s a sewing machine
I get a lot of simpler stuff -here they don't have to go to boat - done
for pennies
Connect the receiver to a UPS( like for computer) Receiver will never shut down.
U can also connect stereo and TV - they will stay on without a hitch during crossover
Thats BS. You have a 5yo boat that gets used 3 month a year...on weekends...when its not raining. Unless you did something to compromise integrity (ie added cleat etc) i would get after Searay HARD