Just found this:
http://rpmtransmissions.com/files/GTdiagrams.pdf
It's a top level drawing of the Ricardo with most of the interfacing dimensions.
If anyone else is putting a Ricardo 6-speed into thier car, this can save a lot of time. It would have saved me some time if I had known about...
I'm putting one into my GTM/Ricardo build. Fabbed up a shifter/cable mount. Not very pretty, but very stiff and light and wont be seen once car is complete. Waiting for my custom cables for Midwest to arrive.
The Shifter is VERY high quality...super smooth action and a fairly short throw...