Thanks for tips Fixitt and Sanjuro. (why, oh why, do you still use imperial instead of metric system
)
bigben2k, I'm not using aluminium, for outer block, I'll use plexy, with cone soldered to copper base but on curcumference not the bottom, the bottom of the cone will be in direct contact with cpu die. First results this weekend, if I get some time to make plexy blocks this friday.