Hilly,
Sorry, my basic "proto" board takes 8 hours, not 6, I can't read my own writing.
If I wanted to speed the job of building an 8' SUB up for production this can be reduced to 5 hours, if I hot wire or even less if I blew my own EPS to final shape like prouction boards.
I build these Farrier Tri's below for hobbie/poket money, this one Volantis, took 2500 hours, my boards are made from their leftovers, apart from the EPS.
I'm involved in streamlining their production in the Pilippines at www.melvestmarine.com, so well aware of labour costs/hours OS.
I am not knocking production boards at all, there is some crap out there but things are improving every season.
There is a demand for light short high performance SUB's & this in time will be catered for one way or another.
Cheers
Dean