I tried that out. Fun, but difficult. I now have a greater appreciation for walls. I've been trying to mod in a new barracks (stables) and a new unit (cavalry). Got the files and pictures sorted out, but it won't let me import them into the compressed Base File folder. Will it work if I put them into an unzipped file called base mod?
I'm assuming mushroom people will have a tech level between Masklings and Humans.