I can't wait to try the blopp or a manufactored board that size, but the weight doesn't matter. The shape will make it better thant plywood.
the plywood 1metre board from the video above weighs around 1,3 kg - you simply doesn't feel it on your feet, as the short length of the board also helps making it feel light..
it is the most simple board in the world, it's just a plate without rocker or anything..just 9mm of plywood
first proto of my one metre plywood (the straps where nailed on!!idiotic....):