Rolf,
I sent 2 message to Phil through the forum message utility but didnt receive any reply. Will try again.

Thanks for your reply. The layup I use is based on the LR2 layup with the extra strength of doublers in the middle part of the boat.

Think I will go with the timber sheer clamp but use carbon/h160 foam/carbon bulkheads and maybe composite chainplates.

Shane