I make and sell game hoist and looks like you and your buddy did a great job in modifying the unit. Home you get to use it soon.
I can vouch for Holt's if anyone is looking for one to buy. That thing works great! I use it for loading and for skinning if the skinning rack isn't available. Biggest animal picked up so far on mine is a 270# hog loaded on a Polaris Ranger. and yes, it swivels!