I did not know much about Alpina, but I stumbled upon a video on youtube from 2 years ago - a guy was given a full tour of their factory. I never realized Alphina is such a small establishment, they are essentially a boutique, where most everything is meticulously made by hand. They do outsource some of their production, but their quality control extremely strict, they reject parts over the tiniest blemishes. I also learned that they make and sell parts and offer on premises factory repairs/rebuilds on pretty much all of their models that they ever produced, even from the 60ies when they first started.
I have a whole new respect for their operation, I hope the merger with BMW wont mainstream and diminish them the way they did it with the M.
This is the video I watched, it is in Russian, but still may be informative just to see around the factory.