Ok got the first half of the pump done to day and got the second half all modeled up and the first operation for it programmed.
On the first half of the pump I flipped it over and milled a pocket on the back side.
Then cut the side pieces away.
And then cut the tabs down on each side.
I made a little fixture plate to load on the water passage holes I drilled them to .125 instead of .1 to locate on them.
I'll probably do the second half about the same way.