It need's to be fixed to the car. As in it can not be removed by any expected forces from racing.
i.e. a gauge screwed into console will hold
a 10kg object screwed in by one screw will not.
The S2 looks like this - sorry bout the shit pics but its the best I could find
the S1 with air bag looks like this
and S1 with no airbag looks like this (kinda like R32)
You want to go in a car with 350rwkws with a driver who has been driving a stock supra and stock commodorre for the last 2yrs?
You are insane!
BTW - what made you choose SCR for the tune? Did your engine builder suggest them?