I took a different approach.
I cut some big holes and installed a couple of cheap kayak hatches
and then stuffed the area under the hatches with those metallic 5-
liter bags from the "box wine" that is now sold cheaply everywhere.
The bags are ridiculously sturdy and are simple to inflate. Unlike
plastic milk bottles, their shape is completely adaptive (although
you can mix and match.)
The bags do not leak or otherwise deflate. You can inflate them to a
size bigger than the hatch by inserting everything but the spout and
*then* inflating the bag. I put maybe 15 or 20 under the vee-berth of
my P-14. I used them half- or two-thirds-full in order to get them
into all the weird little nooks down there, thus maximizing the
volume of air thus trapped.
(I'd been keeping them for a couple of years thinking the things
would come in handy for something.)
-----------
Rich Duffy
P-14 #362
Kula, Hawaii