May I throw in a thought?
With the general tippiness of any light boat it is a good idea when going
forward to keep one's weight close to the centreline. Thus, from the
stability point of view a hand hold should be on that centre line, forcing one
to lean towards the middle of the boat.
Subject then to the location and the track of the moving cabin sliding hatch,
the best place for a handhold would be behind the mast step, on the centre of
the cabin top. There may be room for more than one, in line. Another good
place for a hand hold would be on the outer (cockpit) side of the after cabin
bulkhead, horizontally like a towel rail. Useful spot for keeping sail ties
and other short pieces of line.
Bruce Longstaff
Uxbridge GB