Firstly, there is no such thing as a stupid question here.

Any recomendations on plans or where to get
> them. I'm dirt poor so the cheaper the better.

The cheapest place for plans would be Nick's book, in it He's got offsets for 3 kayaks including a double, I've posted the link below.

> Where does one get kevlar, carbon fiber,
> fiberglass?

Try ringing around, local importers, distributors and manufacturers would be the best place to start. I'm in Australia so I can't give you specific information, My local boat shop was selling 6oz glass for $8.90 per metre, I eventually tracked down an importer who sold me the same stuff for $4.75 per metre. He even gave me an extra 4.5 metres free cause it was the end of the roll and gave me a metre of 6oz kevlar as a free sample. These people tend to deal in huge quantities of glass cloth so they don't mind giving away a bit extra to non professional builders, as opposed to the local boat shop who want to squeeze as much cash as they can from their stock.

Good luck with your project.

Paul.