Ok, got my new mac mini in with 10.7 and installed final cut studio 2, the one with fcp6 without issue. Here is how.
1: It requires you have a snow leopard disc. I had a retail copy, not sure if it will work with an OEM copy. Last I checked BestBuy still had some copies. For $29 it is good insurance.
2: Insert the disc and go to the install option packages. Run the installer and choose Rosetta. When it finishes, it will give you a message that it was designed for an older version of OS X and you may want to update. Just click finish.
3: Install final cut studio 2.
4: Enjoy.
I have tested with motion and fcp so far without issue. Mileage may vary. Give me any feedback you may have.
Sam