Thanks Eric. I will consider that. I did beef up the aft deck and added extra blocking between the spreaders (deck beams) where the coaming will sit.
I am amazed at all the details I did not think I would need to consider when building a boat. It is making for a fun learning experience.

Stefan

: Honestly, your weight should not be much of a factor in the coaming
: attachment. So long as the kayak is able to support your weight,
: the coaming should as well. You really don't put that much
: pressure on it. You might need to evaluate the aft deck as you
: will probably be sitting on it to get into the boat. Modern
: kayaks with a keyhole coaming make it easy to sit on the coaming
: to slide in. You can't really do that with a traditional boat.
: You have to sit down on aft deck to slide in. Take a look at the
: tutorial below. Notice where he puts his hands to slide into the
: boat.

: http://www.capefalconkayak.com/usingyourgreenlandkayak.html

: I paddle a Sea Ranger with a floating coaming ring and it is
: surprisingly solid, but I don't sit on it as I have found that
: those two inches of height difference really make things
: unstable.

: Eric M.