Nice YouTube video.
Several comments.....
First, the video shows copper pipe feeding his heat exchanger. I ruined one due to fatigue (using copper). Google, "Air Compressor Discharge Hose". They are often used on trucks....and are stainless braided. They are made for 200psi and higher temperatures. I did a quick search, and found this:
http://www.anythingtruck.com/category/htp-brake-air-hose-compressor.html
You can use something similar depending on length. Being flexible, it doesn't transmit vibrations.
I wasn't too worried about the "flow" (ie diameter of piping) through the heat exchanger. With an 80 gallon tank.....you are basically "recharging" the tank vs. maintaining a constant airflow. I think my cooler has 1/2" NPT connections.....which is plenty.
Regarding "pushing" vs. "pulling" the air......I'm not sure it matters. Airplanes can be configured either way....and they somehow still manage to get airborne!
My setup.....I pull the air across the heat exchanger. It's an 120VAC fan....so there's no "reversing" the wires. You'd have to physically reverse the whole fan to make it a pusher instead of a puller.
My "cooler" is an B&M #70274. They have them at Amazon. It does a great job of cooling the air.
Reviving this thread reminds me of days long forgotten. I remember the panic I felt on "killer car wash days" when the pneumatic pumps would start icing up and run erratically. No More. I'd almost forgotten what that was like. Ever hear a
FloJet start to slow down...and then go "Bam" with ice getting ejected? That's moisture in the air.
Do it. You'll be glad you did.