On 24 May, 03:04, Dave Smith wrote:
I understand that people have built Canadian style canoes that join in
the centre. Do you know how the join is made as a friend wishes to
build one but is not sure as to how he can get a watertight strong seal.

There's an open canoe oriented website/forum where you might get some
more advice, if you haven't found it yet go have a look at
http://www.songofthepaddle.co.uk/