Here's video, ok not the best quality, about making a 9'8" longboard. What you'll not see is: picking through stacks of lumber for just the right woods (1 in 10 is a good day), cutting, planing, sanding planks, glueing up planks, building jigs, tweeking - steaming - bending - begging wood into place, trimming trimming trimming, and those 2 am wake ups thinking of a new way to trim/tweek that piece of wood.
Oh, know when you say something and then knock on wood? That's an old German, probably many other cultures also, superstisition that for good luck you knock on a tree. Building HWS boards we knock on wood a lot.
Anyway, this kind of gives you an idea of what it takes to build hollow wooden surfboards.
Dan and Tom