I like the permaculture philosophy and I have read most of the permaculture books out there. However, the truth is that permaculture is not going to feed you. With the possible exception of the tribes in California, no natives people considered the acorn as a staple. Rather, the staple was corn. In South America, it was the potato. In Europe, it was wheat and barley. You just can't get a high enough yield from trees in term of calories/acre to feed a large population.
Also, have you ever tried to produce acorn flour from acorns? I have, and it is a pain in the ass. You have to leach the acorn meal many times to get the tannins out. BTW, if you are interested in low tannin acorns, check out these guys:
“With laws shall our land be built up, but with lawlessness laid waste.”