I think that a 3D print off the .STL file I attached will solve 80% of the headaches and uncertainties and allow you to take any measurement directly from the printed part when you're ready to machine a copy. Of course, don't expect to see .001" precision with plastic, but even when I tried and calibrated a 3D printer of mine 6-7 years ago (and never had any previous experience), I was able to stay within .040" or so. For this part such tolerance it more than sufficient except hole diameters and, maybe, a couple of areas of contacts.
If you don't have a 3D printer, there're many online places which can print it for you VERY inexpensively. You just send them the .STL file. And you can ask them to verify a few (2-3) key dimensions before they print and send you the printed part. Usually, the services hire young guys who love to make some extra cash at home using their printers. Sometimes they advertize directly. And they know how to handle and correct files, print to size, etc. I dealt with them a couple of times and was very pleasantly surprised by their prices and quality. I never tried metal printing expecting high costs, but it's worth to inquire. Maybe by now it's more affordable (although a have a doubt).
).
