Mk I moulded forward hatch

The forward hatch on the Mk I and Mk II is moulded fibreglass. Many owners have replaced the centre of the hatch with clear or smoked plexiglass.

Another minor point of difference is the handrails. The Mk I and Mk II all had handrails that extended forward of the mast while most Mk III and Mk IV handrails stop near the mast step; longer ones appear to have become an option.