Well, I guess I'm not real serious about it at this point. Beautiful bike and my size as well! But I think the 531P is probably not the best tubing choice for me until I loose about 30 lbs.
You might be able to get a picture from the front kind of in line with the brake mounting bolt that would show the relative clearance all around between tire and frame.
In the back, the tightest place is probably between the chain stays and the sides of the tire, might be hard to get a picture of that, but it could be at the brake caliper and the circumference of the tire.
This would probably be useful information to someone considering the bike.