The 3rd option is to pre-fab composite panels, then build your structure from them. Sort of a cross-over method between the plywood structure & molding - like Tuna did on classicmako - (p2, 03/29/2009 post).
http://www.classicmako.com/forum/top...08&whichpage=2
I've been thinking about these methods as well for a LP/LW combo (Strick - you set the benchmark w/ yours) & maybe a console or dog-house. I lean towards the mold I have to say - just not convinced I could get the glassed over seems to fair into the panels (or at least how much time it would take) vs pulling from a mold.