: Hi
: What are the desired qualities for designing an easy / learning to roll a
: kayak
: I can see a low aft deck would be good - -

Anything that helps get the kayak under you when it is on its side will make rolling easier. A narrow beam, flared sides, low freeboard (low shear and deck) under your layback area, a wide cockpit opening and a low volume hull all help. Most of these are compromises to a good handling open water touring kayak so pick your priorities.