We bought a Highfield Ultra Light 260 this year. Aluminium hull. It fits on the front deck of our Santorin inflated or on the afternoon deck with the bow deflated or completely deflated it sits easily inside the grab rails.
Also we got a 2 stroke 9.8 outboard. It weighs the same as a 6hp 4 stroke which is the max recommended by Highfield works fine.
I haven't attempted to stow it in the lazarette. My guess is the depth won't accommodate the width.
'OCEAN HOBO' SN96