I've no clue as to brewing with acorns, but as a kid I made acorn flour & used it in pancakes; I've even made a sort of acorn bannock with it. It's pretty labor-intensive though. You have to leach out the tannins. There are 2 methods: hot & cold. I used the hot method described in Wildwood Wisdom by Ellsworth Jaeger; but WITHOUT using the wood ashes. There's also the cold leaching method, but that takes a few days.
Either way, it's a LOT of work, with little usable product. Though, if the boiling removed the oils along with the tannins, you might be able to use the acorn flour as an adjunct in a brew. You might get more flavor out of it if you toasted it in the oven, not sure though. You should use White acorns though, red are way too tannic.
Regards, GF.