Spokane, WA
I'm assuming you've seen the files section over at pinball makers, http://pinballmakers.com/wiki/index.php/Files_Section that does have a few different lower playfield sections. Beyond that I frankly would not trust anything in FP or VP if you want accurate measurements. Some are made by people with obsession for details and have an original to measure, others are just based of photos stretched to whatever shape, others, who knows (and I've made many VPX tables). Other wise the high res scan you have of MB would probably be a pretty good starting point.
The other opinion I have on the matter would be to make it in VPX instead of FP, then you can actually play it with somewhat realistic physics. Others may have a different opinion 
