shotgun the first one made! lol
you could make them cheaper + better if you ditch the blow off valve and mount the throttle body before the charger...
I dunno how much room there is for real, but the ultimate setup would be
supercharged 6 CAI->airbox->throttlebody->supercharger->inlet manifold.
you can buy coolers for under 200 bux, and you could plumb a cooler between supercharger and inlet manifold....
considering you have to modify the pulley of a standard toyota charger to fit the commodore belt, you could propably size it down a little too?
plus if you have the original brackets to measure up against, I can't imagine it to be all that hard!
i agree with 900-1k for the kit, though this should include blow off valve etc, unless throttle body is mounted as stated above... then there's no need for bov and the car will likely run a bit better.
let us know