Awesome ! Where did you have the waterblock machined ?
making block was an interesting part of the project. It was done at a 'Steel Workshop'.
cutting, finishing was done on lathe machine, then they weld it with gas-welder. They were very experienced with all these so overall work was done nicely. However, it needs to be done carefully, because it gets too hot while doing welding job, and copper surface could bend up due to too much heat. Same with lapping process on electro-platting machine ( the machine on which they lap steel parts, like our bathroom accessories, thts why the look shiny ), it also needs too much care because too much heating could loose welded joints.
Materials I have used to make this block are a copper plate ( 60x60mm for CPU contact surface, 50x50mm for top surface where nozzles are welded ,3mm thick ), a piece of copper pipe ( 1/2 inch, 50mm diameter ), 2 brass nozzles.