Ok, I think I got the CST where it needs to be.
I need to redo it as the first attempt was more of a hack job to see if it would even work.
Just for reference here is the kensington orbit, it fits perfectly in my hand.
Here is the orbit with my hand basically palming it.
Notice the angle of the wrist.
Here is the hacked foam wrist pad, part 1
Here is part 2 with the filler piece in place.
Here is part 2 in all its hacked glory. I did it with a razor knife and it was hard to be accurate. I didn't want to slip and slice an artery : )
And finally, here is my hand at rest on the CST. My wrist is now much straighter then before.
I have another wrist rest to play with. Ideally, I would be able to carve it as one piece. Let me drink a few beers and give it a shot.