Would be interested how you "drilled" open the large pulley to fit the hanger of the trucks through. And also how you then aligned this pulley with the wheel so they were not off-center causing the belt to tighten and loosen on rotation.
Would be good to update thepist regarding Alien Drive Systems which now support caliber trucks and do US/Canada shipping.
http://www.aliendrivesystems.com/caliber--holey-conversion-kit.html
http://www.aliendrivesystems.com/-alien-drive-kits--caliber-truck-usacanada.html
