I just bought a 2004 Grady White 228 Seafarer back in Maryland and included with the sale of the boat was an after curtain similar to what you pictured. The one that came with my boat was used but still in very good shape without any rips or tears in it and all of the snaps in good working order. It has the little channels on the underside of the hardtop and has a "groove" that is about the thickness of a pencil so that you can slide the top in underneath the hardtop. That being said, I don't think I'd want to try driving the boat, either on land or on the water, with the curtain in place. Even if you had all of your canvas up and blocking a lot of the wind, it would block quite a bit of your vision and if you didn't have the canvas up, I think it would pop off the snaps and fly around. I don't think you'd lose it as it'd still be attached to the hardtop and don't think it would come out of the channel but yeah, I don't think it would be a great idea. I'll use mine a lot since I leave my boat on a mooring buoy during the summertime and it'll be nice to keep some of the seagulls and other wildlife from jumping/flying into the boat, eating part of a fish and leaving the rest to sit there for days on end. The neighbor has either a 255 or 275 Freedom and has the back curtain as well and while it's not perfect, nor does it keep everything out of the boat, it does do a good job of keeping most things out. River otters will oftentimes jump up into the boats on buoys and enjoy snacking on a fish as well as the seagulls, as I mentioned above. I'll probably either buy a front section or make one of my own, for the front part of the boat where the cockpit area is to keep as much wildlife and dead fish carcasses out of the boat as possible.