Proposed hatch rail/slides go full length to the break and will also have the removable seahood mounted on them. The design will have a water relief channel on the inside running along where the original molding rises.Since these here are wood forms intended to make female molds into which the final frp pieces will be laminated, the resulting pieces will be easy to trim lower if necessary. They look rather tall, I like the ones you see on the Cape Dory 25.
Really like the original curved hatch. But am thinking of a light-emitting, flat lexan slider riding on teflon on the lower rabbet with the traditional metal keeper on top. {A flat surface for a map or a sandwich and salad. Just a flat surface!!] If I curved the hatch I would gain headroom, but flat it's only about an inch gained! The real purpose is to protect the slider from being striped off by a comber, assuming the rails can take it.