Was reading this issue of Surfer's Journal last week
http://www.surfersjournal.com/issues/21-6Had a really insightful article up front about what they're doing with CAD design and Volume as the new most important factor in board design. The unit of measurement all agreed on is "the liter". Rusty and others are working on perfect formulas taking into account body weight (more with our winter wetsuits) to devise what the perfect Liter amount should be in a custom design.
Don't hang out in shapers shack so this might have been covered before. New to me. Found it fascinating. Next custom job I get I'm making sure this is taken into account.