Initially I debated about which one to start first. For instance, the cross slide casting should probably be done before the parting tool holder, as the height above the cross slide is determined by the cross slide itself. The cross slide requires dovetail and T slot cutters, which I don't have yet. Best to choose one that I already have the tools & equipment to finish as my first project, so the lathe faceplate it is!
I removed the vise and used an indicator to verify that the table was flat to within 0.001" by adjusting the front support post and the knee screw, then moving the ram forward and back on the table. I want to make sure this angle plate is actually square!
I then used a 1-2-3 block and my clamp set to clamp the casting to the side of the table as shown above. The first operation took a lot of passes and occasional re-sharpening of the tool, but once I got through the skin, it cut nicely.
I continued, using the top and side of the table, along with a 1-2-3 block, and the clamp kit to square up each of the sides in turn. It required a little contemplation, but I was able to use the table to clamp the part so that I was always planing horizontally, no need to plane using the top slide, which would have had to be indicated in to ensure perfect vertical movement. Though it could easily be done, I wanted to eliminate as many variables as possible.