Martin,
As far as I know there haaven't been any cracking issues with the solid mounts of the 930s whether street or racing. If someone knows of some they can chime in. Here is how I fabed my mounts.
You can see the neutral gate mock up in this photo. Looking from the rear in my pic, 1st is down and into the trans. 2nd is straight back(out). 3rd is in, up and further in, and 4th is straight back. Reverse isfrom the neutral position, down (hard) and into the trans. There is a spring that keeps the shifter from going into reverse by accident.
Shifters being used are several types. The single rod type that does all the rotating and ins and outs.
There are some commercial units out there that incorprate cables.
Some salvage yard Toyotas of the late 80s that are being used.
With the Toyotas, the ins and outs are reversed and a Z bar has to be incororated.
Here is the neutral gate and Z bar together that I fabed up.
If you don't like the Z bar or the neutral gate setup like mine(some have it in the horizontal plane) then you have to have cables long enough to reach the rear of the trans to do the direct route of moving the shift rod.
Here are some of the methods used.
You are only limited by your imagination.
Bill