Ha! I am not the only one with plywood screwed onto the wall.
Looks great, now get that O2 tank chained to the wall. I also set my pressure gauge to read close to 32 psi with the equivalent 32% into the stick by adjusting the needle valve. Then all mixture adjustments are made on the regs main knob. In fact the needle valve has the handle removed on mine.
One thing I would highly recommend is a solenoid on the O2 line coming into the mixing stick. That way it shuts the O2 off if the compressor shuts down. The scary part is if the compressor shuts down, fills the stick with O2, then restarts all on it's own, and goes BOOM!