I acquired water pump kit from a fellow member and have finally taken it out of the box, studied it at great length, and even had Rich_D sit and go over it with me. I can say, without a doubt, this will be the most complicated and precise machining I will have done to date -- after all, everything I know I learned during the building of my mogul.
This kit can be built to pump either water or air. I'll be building it as a water pump.
(All of these photos are thumbnails. Click them for 1024x768 resolution.)
The kit:

Starting with the valve body casting, a very long time getting it absolutely perfect in the 4-jaw:



Faced and turned to dimension, ready for boring the steps for the reversing valve stem opening:

Boring completed:

First setup complete... next up is a bunch of setups in the mill:

More to come!