They are very accommodating. Swing by and ask, you'll probably get a tour. Though you are rolling the dice a bit. If they have something going on, they may not be able to do it. Better if you arrange it ahead of time. PM VMan ahead of time and let him know when you'll be around. It'll probably amount to a little more than you giving a heads up as to when you'll be at the factory. If not, I'm sure he'll work out a time for you that works.
They are an awesome crew there, it is nice thing to extend them a little courtesy so that they can make sure your visit is awesome.