Yea so i Used two shelves of triplex in the shape of a penny board in this case.
As substrate I used a mix of hemp and straw 50/50 ratio. I prepared it in the normal way ( cooking and so one) en dan i started building some kind of sandiwch : a layer of mycelium - triplex- layer mycelium - triplex - layer mycelium.
Then i packed it in in cling film and made sure there was enough tension to keep the shape of the shelves :). I let that grow for like two weeks and then put it out of the cling film to continue growing until last week. At least I baked it off ( a bit to early but I didn't have any choice due to my deadline.
I think that if you would experiment more around strenght and so on, it will be possible to make a functional board though but my model is pure easthetically now at the moment
I think that if I had let it grown for a longer time it would have become stronger !