Just grabbed a couple of shots I took while test-fitting my most bizarre addition ever: a companion shelter that will allow me, at anchor, to sit upright inside even in the rain. It folds up and rests uneasily on the forward seat when not in use.
But you can see the cabin pretty well. The main hatch slides, while the fore hatch drops into place. The forward window comes out of its slot so that I can more easily access the foredeck through the cabin. In practice, though, I nearly always go forward on the side deck, holding on the the edge of the main hatchway. Lack of headroom is tied with another big problem with my cabin: when I sleep on the starboard side (the footwell on that side is filled with an insert), my knees are trapped under the edge of the forward coaming. This makes it impossible to roll over, for instance, without fully waking up. I just realized that I could lay diagonally (across the CB trunk) more easily, and I'll be trying that out probably in a May trip.
Unfortunately, the Mark III came out well after I built, or I'd have a much more elegant boat!