Will this master switch placement pass tech?

I don't think a driver who is well belted in would be able to reach that, so probably not.  You want it somewhere that any driver and corner workers can easily reach, even those without your go go gadget length arms

Cage bar, left of steering wheel on both our cars.

maybe two kill switches would work better? because this does not look like comfortably reachable from outside the car.

A typical situation is you are called in to serve a black flag and the judge is talking to your driver and he wants to kill the car. Do you think the judge would enjoy getting to it in it's proposed location?

Right from the rule book...

"3.G.1 Master Electrical Kill Switch. All cars must have a racing-type master electrical kill switch easily turned both off and on by the belted-in driver. The control for this switch should be red; the OFF position should be clearly indicated; the switch should be easily accessible from outside the car; and the switch should be clearly marked by a three-inch or larger lightning-bolt symbol. All electricity must be interrupted by the kill switch (if you don't do that, the engine may still run off the alternator even after the battery circuit is disconnected). Don't put the switch where it's likely to be hit by another car in traffic or crushed in an accident."

No indication it needs to be accessed from both sides...and ours certainly is not and COULD not be placed in such a way on the racevan.

hmm, i shall find an average sized human being for testing purposes.

We mounted our switch on the floor next to the driver and ran a pull cable to the rear window behind the driver with a large hole in the lexan. Works great.

Looks to me like you could mount it on the side of the tunnel next to the fire extinguisher and keep your existing cabling.  You can set up a cable remote from there if you w as nt.  Just sit in the seat and see where your hand falls next to yhr extinguisher and thats your mounting spot.

Failing tech sucks...bring a cable just in case and return it if necessary.

I remember something about being able to turn the power back on after turning it off while strapped in.  I think it was TEO who brought it up.  It was about getting out of the way after an incident.  I don't think an off cable will do that.

The reasoning for a center mounted switch is access from either side of the car.  If the car is against a wall on the driver's side, access to a down bar mounted switch would be limited.  That said, I prefer the down bar mounted switch mostly for being able to start the car while standing outside...I can reach the starter button and the throttle at the same time.

To comply with Chump and Lemons, we mounted a second switch on the tunnel next to the seat where a driver can reach.

TEO teched our car with a center mounted killswitch and he made no comments about it. If it passes in his eyes, I think it's okay.

One other consideration for some sort of external access, safety crews are trained to NOT reach into a car that has/had any signs of fire. I don't know if they'll reach inside under other circumstances, though.
One of my cars burned for a little while, and the switch was on the cage next to the a-pillar, no more than 4 inches from the window opening.  No one touched it but me, after the car was delivered to my pit space. Fire Bad!

I think I'm going to move it back from the dash on the passengers side of the tunnel.  I'm using the existing wiring, and it runs along the right side of the car,  and the battery, and the main distribution block in the car are on the right side as well, so I don't want to reinvent the wheel and run it all on the left side.