Clubsport accessories

[scampster]

Having ordered Clubsport on the GT3 i am now wondering about
bits you get and how best to use.

Does the extinguisher impair the passenger leg room?
If so is it easy to detach/attach?
can you locate it elswhere in the acr

Does the harness stay out of the way when using the seat belt?
I understand the harness is not legal for road use.

Has anybody had the Battery master switch fitted?
I pressume this is to be able to prevent sparks in an emergency but
could this be a benefit when the car is being stored to
prolong battery life?

Cheers