3/4 inche is good enough , the 環保夾板 or 環保板 ?? 環保板usually made by wood 木碎, fiber (纖維板), they have many different density , the Higher Density one is good enough to make the Cabinet . For kitchen better to use the Plywood(夾板) , esp. use the 細/幼心板 , this kind of plywood got more layers , it has stronger supporting and loading ~ more long lasting also ! also more expensive !