I just got the Volk AC3's, I watched the guy in the shop mount the marker iPT bindings. If you have the PCOS iPT bindings I could try to scan the mounting instruction page for you if you want. I'm sitting and looking at the directions that came with the ski's as I'm writing this. This is NOT the Marker technical manual, but a sheet with pictures on it showing the steps. I'll do my best to describe:
Look at the bottom of your bindings; You pull out a piece of plastic from under the toe piece, place the Piston Controll Oil Suspension [PCOS] in its place, and there will be a little metal clip on the binding that goes into a slot on the PCOS body. There will be 3 nothes in the rail, 2 for the heel piece and 1 for the toe piece. The bindings slip over the rail and then you slide them on forward 40mm. Turn the locking screw clockwise 90º so it's in the vertical position and now the binding is locked in place.
Next you have to drill a hole for the PCOS. (You'll need a 3,6 X 9,5 drill according to the instructions.) There is a templet you'll need to line up the hole. -I don't have that anymore. In which case you'll have to use the PCOS as the templet. The drill bit looks like nothing I've seen at the Homedepot with a built in pilot bit. -Probably something a Volkl dealer will have.
I wouldn't do it myself if I had a pair of second ski's that needed bindings mounted. I'd definitely let the shop do it, and I'm the kind of guy that usually insists on doing everything myself. Best of luck to you though!