Ski builders/bored engineers - Here's the basic explanation of the Blizzard "flipcore" (this from an Epic shop that will remained unnamed, since they still have the temerity to be skiing in June), but pretty much what you can find other places:
"The Blizzard “Flipcore” skis take the opposite approach by using a core that is basically built upside down. The molding process then does not have to place stress into the core when the rocker is shaped."
Now I have skied a flipcore ski, and liked it a lot. So it appears to work. All for it. But I cannot understand how building a laminate or pressing in a curve upside down is in any significant way mechanically different than building it or pressing it in the normal orientation. Assuming you're not Volkl, and cutting your curve into the laminate itself, you begin with a straight piece of laminated wood, and then you apply pressure and heat. Stress one direction versus stress 180 the other. You will be pressing central camber with gravity, sure, but that's a trivial force compared to those being applied to bend the wood.
So why is doing it upside down more than just turning the camera upside down?