i need a durable boat made of cheapest fiber glass and cardboard.?
Make the frame out of 4" PVC pipe, then line it with the cheapest thing that won't crack from your weight.
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http://www.gaboats.com/ simple and light and quick to build - you can cover in Fiber glass if you like.
Check out these instructables:How to fiber glass - used to fix a kite board but it's a great instructable on actually fiber glass things. Building a little row boatBuilding a greenland kayakCozy boat part 2Have a look through those for ideas on building a boat, I'm considering building one myself, just for fun...