I'm not building a bar per se, but in our entertainment room plans for downstairs we are building floor to ceiling, wall to wall shelving. At the back end of it, I will have a bar fridge and some shelving/cupboards for my Scotch collection and some glassware. The plan is to be able to set up that area as a mini bar when needed.
Won't be until the spring though. Good luck with your plans and post pics when you get at it.