: Light is good, but somehow that sounds like it leaves things a bit on the flexy side.
That's fibreglass for you.
: Unless they're using a core of some type.
: Anyway, it sounds kind of spendy.
No, it is NZ dollars so is cheap for you in the States. About 78 cents NZ to the US dollar.
Look at -www.sissonkayaks.co.nz
I think that URL should work. He only builds to orders. Also has strong opinions. You could also e-mail Paul Caffyn if you were serious.
Alternative is wood. My own kayak before fitting out was 13 kg. Adding rudder, pedals, hatches etc. brought it up to 18 kg. Could knock that back if I really wanted to. Now that doesn't flex, doesn't have a gel coat crack problem if it hits rocks and is tough.