
I prefer the Rockpool (latch) solution to the Valley (bolts), and great strength is not required as we don't take our rolling boats out in big seas. Mike at Rockpool has already very kindly pointed me to his supplier of latches, so I'm OK there.
Trouble is, Anglsey is a long way go pop in and check on how its done, and chances of him converting a boat at any one time are slim. I'm quite confident about the cutting and laying up / glassing in of the bulkheads with matching rebates, but I'm curious about the exact details of the latch recess boxes.
Derrick Mayoleth has a suitable picture on his blog, but as I said, an open/closed of both sides would help.

If anyone has any close up photos of the latches, in OPEN and CLOSED position, plus a pic of the underside (inside) view of the latch box they can post, I'd be very grateful. Or PM me and I'll send an e-mail address.
Cheers
Steve