I've found only a few photos of modified grips online. I'm going to take a lot of wood from the rear of the grip to 'stand up' the profile as much as possible- I just find the broken-wrist hold of the factory grip VERY unnatural. In the photo below you can just make out the lines from a pattern I made from a Ruger Mark .22. The Ruger has about the most laid-back angle of any grips I have, and like. So I figured patterning the angle to the Ruger grips might make the CP-1M more comfortable. I expect to do a LOT of trial fitting before I'm done but I believe it will be well worth it.
Here's one a fellow did down below this post:
This is from GTA: