avoiding foam cause : dont have vac pump : divynicell is a PITA to sand, and is very expensive, so, shapind a BIG bloc of corecell or any foam IS : HARD to get nice shape, expensive, pita.
scewing a foam board on the rocker table does not work, it's foam.
i have a core shaped and railed ready do do, but cant get a pump, so, while waiting, playing around with wood.
wood is cheap, easy to grind down with power tools, easy to scew on table, glue it with wood glue ( just use the water tight stuff ) and does need only one layer of glass ( cheaper ).
the spring back was not an issue, had moderate one on the rocker and quite non on the concave ( will send some pics soon, actually, i heard so mutch about the spring back that i put a lot off rocker in the board and, had to mutch rocker when taken out the scews, even after grinding a lot of material down, witch lowers the rocker a bit, had to mutch i had to put 60 kg on the center of the board after laying the glass on the bottom to lower the rocker.
an other reason for wood board : the low price let,s me try shapes that i can after reproduce with foam and carbon if i like them.
finished board will be : 30 dollars for the wood, 5 dollars glue, 1 dollars inserts, 25 dollars epoxy, 4 dollars filler, 20 dollars glass. oh, and let's say 15 dollars of sanding discs/betls/papers.
around 100 finished for a door.