This is the overview. The bottom hull shape is off the Oz Mk II plans. The rest of it is mainly dictated by purpose: My main concern with the eXpedtion PDR is the ability to row for extended periods of time.

By the time you get comfortable rowing ergonomics in a PDR, the sides are 20" high. Rather than leave them 20" high (and have to deal with all the wind force that would be affecting my course) I decided to make the ends 'droopy.' I actually like the shape - it looks sorta shark-like in profile.

The airbox setup is something new in PDR design - mid-craft instead of fore-and-aft (like the early days) or the more common side airboxes. It is really just an evolution on the Oz Mk II design: Airboxes to provide positive flotation plus decking fore and aft.

The sides of the airboxes are sloped for 2 very important reasons: There is no reason for the top to be more than 8 inches wide AND I want to provide structural strength for the bottom.

A 7" top is plenty comfortable to sit on, but I wanted structural support at least 12" in from the side. Rather than make the top 12" wide (uncomfortable and requires bracing to prevent breaking) I followed the Oz plans and angled the bottom of the airboxes in 15 degrees so they meet the cockpit sole 12" in from the edge. This gives me 24" of cockpit space - with open areas under the decking.

Plenty of space for sleeping and gear stowage.