Thanks for the comments.
The ribs or frames are of "bent" construction, steamed then bent around former's, left for a week then the laminates glued together, a method that with the benefit of hindsight i would not do again, however it does produce a very light and strong hull, add to that I decided to make the entire deck + bulwarks including the last few strakes removable in one piece. This was not initially planned and turned out to be very frustrating, though I am now happy that I made the effort. Please find attached photo's.
I have a copy of Tree to Sea and it is brilliant.
I have looked at photo's of the excellent John Hemmings kit.
Your trawlers look great, are they steam powered?