The cockpit covers that snap on are sure convenient to put on/off at the dock, but something I would personally avoid on a classic boat. When I had my cover made for my CVX20, I told them I wanted to use the cover when the boat was in the water overnight or raining, so I built in a couple of design specs... 1. flaps to expose cleats so I could tie up to dock 2. flap to expose bilge outlet in case it goes off 3. put the clip/cinch down point of strap on side (each side) so I can get to it from dock 4. don't build so the cover goes too far down side of boat so it's sitting in water (can't avoid on the stern with the CVX20 though, too close to water so a little sits in water). I also use a vent pole in center and also placed vents on side to get some air flow for drying. My cover works good when at the dock or lift. This is just how I approached it.
Also, the material I used was WeatherMAX... really liked how that wears. Has not faded, is very lightweight (more so than sunbrella, or some others like that) so it's easier to take on/off and roll up and store under bow.