I made a mounting for the CPU block with a central hold down which I can screw
down to exert pressure directly over the core.

My insulation equipment, neoprene and foam.

Insulation for the back of the motherboard.

The blocks’ bases were lapped of course.

The hold down for the Northbridge cooler made from a screw, aluminum bar and
brass rods.

I tested out the rig with just ambient water first.