Hey Brian,
I recently got myself a Kimber SIS kit that Hurricane made when my MEU slide broke down (the screw hole for the metal piece that allows slide lock got striped and then snapped in two, damaged and bent my screw horribly) so I got the kit from UNCo when they had their autumn discount.
Well I fitted the kit (beautiful btw) and I ran into a problem. Almost everything is a drop in fit (unlike what you wrote for one of your Kimber Custom Covert II's on the forum...forgot which thread it was!) but the barrel that came with the kit is jamming up the slide when the gun shoots. I nailed the problem down to the barrel locking lugs on the slide being too deep so I suppose filing them would make the barrel work (funnily enough I ran a complete barrel assembly from a Bell 1911 pistol and the gun functioned flawlessly).
Since one of my upgrade plans is to use a non-tilting barrel, I was wondering whether I can just get the ProG4 steel non-tilt barrel as a drop in fit to the slide. I know its the barrel locking lugs being too deep and since the non-tilt barrel sits slightly lower than the stock barrels to underpass the locking lugs I'm guessing the non-tilt barrel will fit perfectly. However, I dunno if I will run into any other issues as well so if you have anything else you'll like to add please do!
One thing to note for those that are interested in getting the Hurricane kits is that the bar thingy that locks the slide catch and thumb safety in place does NOT need the spring that comes with the kit. I installed it and the spring is extremely weak; the thumb safety and slide catch does not positively click when I move them.