Just a heads up...I played a short game last night with just this and one other mod loaded just to check them out. Noticed that the butcher inventory goes negative at points.
I'm guessing it's completing a batch of production with low inventory and instead of stopping short when it hits the end it completes the full batch and charges ahead for the missing raw meat. I know I saw -1 and -4 a couple of times. Maybe -2 at one point? I used the Mutton and Venison versions but not beef. Not sure about Mutton but I know I saw this with the Venison ones I built.
Didn't seem to affect anything, just wanted to bring it to your attention in case it wasn't intended.
Also, just curious as to why you went for separate buildings for each as opposed to a pull down menu for the recipes? It's great the way it is, just curious what the difference is.
It's a lovely addition.

Thank you again!