A living hydrated mycelium composite containing at least one of a combination of mycelium and fibers, mycelium and particles, and mycelium, particles and fibers is processed with a nutrient material to promote mycelia tissue growth thereafter dehydrated to a moisture content of less than 50% by weight to deactivate the further growth of mycelia tissue and then stored in the form of pellets. The stored pellets may thereafter be re-hydrated and molded or cast into panels that can be separated into cubes or bricks that can be stacked and re-hydrated for making fabricated sections.