Sad news, had to scrub this project.
The base I made was not strong enough to handle the intense torque from the gear belt drive, causing horrific chattering, louder than the exhaust of the blower. (Very quiet blower btw)
I wanted to start using this van asap, so I threw in a White magic Pro1200 I modified a while back (Spinning a roots 56 at 3100 rpm for some serious suck)
Its a kickin machine... it just doesnt have that "Cool" factor that this project was going to have.
Im going to have to weld up a 1/4 plate base for the shaft and blower to sit on, and possibly go without gear belts... but that will mean much larger "V" pulleys, as they can only deliver a fraction of the HP of the gearbelts. And this blower spins FAST (4000 Rpm)