[Paddlewise] Expedition Lay-Up

There was recently in the past some suggestion for an expedition lay-up in 
the style of British boats instead of a kevlar standard construction that may 
be too light.  What goes into a heavier kevlar lay-up?  Is it just another 
layer of kevlar? Is carbon used in the reinforcement?  How does a builder 
choose between using carbon vs Kevlar in select areas of the kayak? Is there 
a selected reinforcement?  How is the deck handled?  Are there some 
approaches that may be better than others?

Thanks. 
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