The aft hatch frames supplied with the kit had a 24 inch radius. The aft deck has a flatter 48 inch radius, leaving a gap. I disassembled the hatch cover and planed the frames down to 48 inch radius, eliminating the gap. This may not have been necessary. According to the CLC staff, this tighter radius was to provide more purchase for the hatch straps, and the seal would compress to make up the difference.
 
 

I drilled several 3/8 inch holes in each hatch frame, and countersunk heavily. The hatch frame kit provided more 6mm scrap with which to fabricate eight "padeyes".
 
 

The padeyes were epoxied in place, with a layer of bias-cut fiberglass over each. Later, these were carefully sanded to reduce chafing of the shock cord. Next, the shock cord was assembled to the proper lengths. To get in to the hatch, the edge is pried up, and one hook is taken off. After that, access is easy. They seem secure and water-tight so far.