I haven't started to DIY yet, but after reading Becky Chambers' book, A Psalm for the Wild Built, I started researching mycelium building construction materials and am now several days down a rabbit hole of learning the pros and cons of various mushroom and substrate types. Will I do anything with it? No idea, but it is cool and provides buildings that will last if the natural, casein waterproofing is maintained, but will decompose quickly once abandoned or demolished and actually feed the ecosystem.