No problem and no I'm not stalking you
The consensus is that shielded wire should only be grounded at one end, hence the bottom photo, length does not matter rather that it can't make a secondary earth.
Your post was handy as I'm having done exactly what your are doing, using shielded wire to the CAS/Crank sensors, trying to narrow down an intermittent miss from the CAS sensor.
One suggestion would be to put a bulkhead earth point near your connector like these. This way it saves pins on your plugs being used for earths and reduces the chance of any 'noise' going through your plug. This way you could just run a single earth on the other side of the bulkhead
Are you going to install a lithium battery?
By the way your car is looking great, looking forward to seeing it in the flesh when it is finished. Still need to organise a photo of the MX5's with ITB's in the Brisbane area.