Ok... I'll redesign it a bit. thnx
Considering the material. If the copperblock works out fine for me, I'm going to make it out of silver I think. I've got a friend that is a silversmith
But back to copper:
What copper should be the best to use. I mean, copper can be hard or soft depending on how it were manufacured.
I'm thinking:
Soft copper.... better contact with core
Hard copper: Easier to work with and I can make the base thinner.
Are there big differencies in the heatconductivity between copper and copper??

(If U know what I mean)
edit: Since this is my first watercooling I'm going to use a Sicce Nova. It was cheap. I'm building the watertank so that I can submerge a bigger pump later on though.