I would keep looking. It's difficult enough looking to buy one of these cars without having some uncooperative moron (the seller) throwing wrenches into the process. I can see him not wanting to go to Milwaukee, for it IS a bit of a hike up there. Mueller's Acura in Woodfield (Schaumburg) isn't that far from anywhere save the far south suburbs of Chicago. At first glance it sounds like a good car, but he obviously isn't serious about selling it, otherwise he would be happy to show you more detailed photos... unless he's hiding something. Cut your losses (in time and effort spent on this ) and walk away...there are probably plenty of other cars out there, and closer to where you live. If you feel inclined to do him a favor, tell him why you aren't buying the car. It might give him something to think about.
What I just wrote notwithstanding, if you decide to pursue this car further, Paul (Brylek) is a friend of mine, and I can vouch for him in that, while not a mechanic (as he stated), he DOES know these cars well. If he went over a car that I was considering to purchase and gave it his "thumbs up", that would go a long way toward allaying any concerns that I might have about the car.
If you find yourself traveling to Chicago to look at this, let us know! We'll be happy to buy you a cup of coffee!