A foam supplier:
http://www.thefoamfactory.com/seatcushion/seatcushion.html
Poke around on their site .. lots of good info about foam specifics..
We bought all of our interior foam and exterior foam first from the above but then from their other site....
http://www.foamdistributing.com/
... with even better pricing but you have to buy whole sheets. Still really worth it and a cheap electric carving knife cuts this stuff like butter. Still either of their sites has great prices, free shipping, large selection of foam types and densities.
Hard to recommend foam for others as we all have different tastes in softness/firmness. We like firm and using their Lux High Quality Foam that is firm/dense we could use 3 inch thick for the berth and cabin cushions which gave us another 1 inch of headroom in the V-berth and...
.... cabin which is nice on a small boat. Even on your knees you don't go through. We liked it so much we use the same foam on both boats, the teardrop trailer and even used it for a couple years at home before buying an air-bed. That way we slept on the same mattress no mater where we were.
For the cockpit cushions we were tired of wet cushions and trying to dry them so went with...
http://www.thefoamfactory.com/outdoorfoam/outdoorfoam.html
... their Dry Fast foam. Not as stiff as closed cell foam which was important to us as our butts were on this stuff day after day, but still firm.
To also add in the quick drying we used Sailrite's Phifertex Plus Poolside Fabric....
http://www.sailrite.com/Phifertex-Plus-Mesh-Dupioni-Poolside-L37-54
... with this combination you can have cushions that were just rained on and lay a towel on top of and sit on them and they dry very quickly. We made them for both boats and you can find the info on the interior and exterior foam and material here...
http://purplesagetradingpost.com/sumner/macgregor-canvas/canvas-index.html
Sailrite has some good videos on covering cushions and you don't need a heavy duty machine to do it and there are lots of pictures on doing it on the link just above.
Good luck,
Sumner
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