Hi
First of all I wanna wish every one HAPPY NEW YEAR.
Today I was in so very good mood that I decided to make WB that would be better than most of the CNC machined ones. So this is a small tutorial of how I made it.
1. Little acad drawing of chanell with all positions of where I was gonna drill.
2. I took 1:1 print and glued it to piece of Cu.
Soory for blurry pic. then I punched points in block (51x60x15mm) for holes.
3. Here I finnished drilling. I used 6mm drilling bit (check the top of the bit) and drilled 11mm deep
4. Next and the hardest part of machinnig was milling the chanells.
I used HAC (human analog controll) mill. I changed the bit with 5mm milling one and start milling in 2mm steps. On this pic I finnished my first 2mm step

I was pretty satsfied with finnished result, here:
5. Then I made the top and cut two pieces of 14mm Cu pipe for connections.
6. I place the top on the base and start soldering everything.
7. Grinding and lapping everything.
And here is the finnished product.
It took me 4h to make this WB.