I used 7 plys of 1/8th inch canadian maple, which for some reason my school had a shitload of when i couldnt find it anywhere around where i live before. I built a relatively simple dimm press, using DOW blue insulation foam to get the shape of the board, and had two large planks on both sides for sufficient preassure. I used titebond 3, which my school also supplied, and fabrigated large clamp things to apply the necesary pressure to prevent delaminating. All the boards were 38 inches long, 1.5 inch of drop, and 7/8 inch of concave. I built them as double dropped boards or topmounts, depending on who wanted what. My shop teacher was a big longboarder/old school skater back in the day so he was cool with it