The doors look great. While I would have cautioned their longevity three years ago as well, I'm glad they held up.
As I mentioned, we only use them on weekends when we are actually on the boat and they were finished to last years. First coat of varnish, thinned 50/50 to really soak into the wood. Second coat thinned 75/25. 4-5 additional coats at 90/10. The doors look the same today as the day I first put them on the boat.