The GT Omega I had before was too difficult to add additional hardware. The new Sim-Lab GT1 Pro Sim Racing Cockpit uses 80x40 alu profiles. Now I can add my HOTAS to this rig, and later I'll use it with my VR headset.
Damn! That is a very sweet setup. Using a base frame of stock alu profiles is perfect for customisation.
Pretty sure there are arduino, or similar, projects for rev counters etc. I've seen people use mobile phones for that too and mounting the phone on the centre of the wheel or behind it.
The only thing I modified to make it comfortable for me was the pedal base. It was attached to the near vertical beams (the wheel base, monitor, and PC shelf are attached to those). So now when I slide those towards me the pedals stay put.
Because the swivel mount was out of stock I bought the hardware from a local supplier and build it myself.
The Valve Index base station (VR) will be attached on a 40x40 profile..and I'll probably attach it to the horizontal monitor beam.
Things I might buy/build: a digital display for rev counter and gear selector and other useful info, separate LEDs to function as collision/radar/ detectors. As I also plan to use the rig for flight sims it needs to be multipurpose.