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Use one of the three plans the author offers, modify one, or design your own
It's basically a "one off" male mold so you could also use any design available as a strip build boat (Bear Mtn, Green Valley, Guillemot, etc).
If drywall compound doesn't suit your needs a light-weight automotive body filler would work as well but smell more obviously. The light-weights sand out quite well.
Good old floor paste wax can sub for parrafin.
The only real trick to carbon, kevlar or S glass is taking extra care to saturate the fabric well, it doesn't absord the resin as readily as e glass. You can use a squeegie to work it into the weave well then flatten it out and get rid of excess resin. A final flood coat over the weave to make sure it isn't exposed. It's the same process as glassing a stripper (boat that is...

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If you are going to use expensive hybrid material "CanoeCraft" has some excellent advice on glassing with epoxy. Might be a worth while investment or there's tons of free advice on forum's like this one.......
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Poly just stinks to high-heaven and is not forgiving to mixture errors like epoxy.
You don't have the noxious fumes with epoxy but you still need good ventilation and protection for skin. I've found proper mixing to be more critical and unforgiving with epoxy.
I would think using epoxy might be the better choice of the resins, it's more flexible and less prone to fracture but it isn't UV stable so needs protection. Varnish for a clear finish or paint and cover up all that expensive hybrid fabric....
Poly or vinylester's should get some protection as well.
Sounds like it would be a neat project for a home builder. If you decide to jump in keep us posted on progress.
Cheers,