I have a 21 year old pool/spa that we have left uncovered for the winters and contributed to the short life of our finish with annual acid wash as a result. This year I plan to purchase a custom safety cover. Our pool shape is irregular and we have plants growing next to our coping, but otherwise the pool is not oversized. I got a quote for a custom cover, including measuring and installation of hooks into the stone coping - $10,000. That seems high. Any suggestions of where to turn for a custom cover? I can do measurements myself. Going to refinish pool in the spring but this seems like best time to get cover. Photo attached.