In the past months I've spent hundreds of hours making one-off carbon body
parts and molds.  To replicate a Vanagon door while maintaining the original
functionality would be so expensive you might feel sick.  I suspect doing
all for doors would cost at least $20k.  The pop-top would be cheaper but as
you mentioned the weight savings would be minimal. ~$4K

The westy cabinents could be replicated at home by fabricating flat carbon
panels and then using the original cabinents as templates (no molds needed).
  You'll be hard pressed to do it for less than $1000.

Carbon driveshafts are pretty common and cost about $1000.
http://www.acpt.com/article3.html

Great ideas but very costly.  -john

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