I'm refining the concept of what I have in mind more and more as this thread progresses. I hear you all, and as a result if I pursue this I am not going to go for the "gimmick" trappings of a viking, celtic, slavic, mythical or other "theme," but I would like to see the idea of large tables, comfortable chairs, and an un-rushed dining experience for all customers. Clearly the dining experience has to be the real draw - the beverages served are ancillary, although meads are available at the most attractive price points in order to give people an incentive to try them. I'm having trouble with the business model still -- most successful restaurants make it because they can move a sufficient volume of customers through the place per night. The slower the flow, the higher the prices per customer need to be in order to hit the profit point. The concept of family style is good, provided you can still keep the flow moving, or keep the cost of ingredients for the food low and the prep time to an absolute minimum. That usually translates into a lower quality product at the table, although not always. Menu planning for that kind of operation is a real bear, since you basically have to set up a lot of low volume continuous output streams in the kitchen... hard to tailor those streams to varying demand -- and if you've ever worked in a restaurant you know that demand can be variable, even on your typically busy nights.
The introduction of various meads might be best done with a combination of knowledgeable waitstaff and a variation on the brewpub idea of a "sampler." Serve customers a variety of small tastes of all the meads available, and then let them order a glass or bottle of the one they feel would work best for them that night. Perhaps offer a discount on that follow-up order to anyone who tried the sampler first, just to encourage experimentation. Hmmm.....