Hi all,
I'm pretty new to that and surprised to see so much info
After 3 weeks reading all the info I came with that:
copper of course.
It will not be smooth but rough.
The inlet is in the center of the block directly on the "pyramid"

and the outlet on the right. The hole at the back of the outlet position is not a hole

(design error

)
I will try to made it in 2 weeks but would like to have advices from experts people
How I came to that ??
cold water directly on the "cpu"
using a "pump/fan" design to flush the hot water away from the center and create a water rotation movement
using a "cone/pyramid" to increase the contact surface/point
am I right or wrong ?????