I don't think that Squirrelcraft will be unplayble. Due to the rarity of Mishra's Workshop, the lack of enchantment hate, and it controlish focus, Squirrel can be a respectful 2nd tier deck.
I am not working in it now, but, maybe a couple of Stifles can replace some Misdirections in counter section, giving the deck more resilience against Strips and serving to mana denial. In the same way, Chrome Mox, as the combo part is redundant, can be placed in the mana section to give more acceleration.

God job TheFarm. I think that you only miss the "Echoing" serie, it will see play in some sideboards, especially Echoing Truth.