Every one thanks for the responses. Im not a math guy so there is no calculation behind my design or component choose. I reduced weight of the column a little its now on 280kg of concrete.
I added a drawing with some dimensions on it so you guys can have an idea of the size. Most all concrete builded cnc mills i can find online are just solid chunks im not trying to a chief a ultra high end milling machine its still a hobby machine.
And in any way it will be way more rigid then my current mill.
Im trying to avoid epoxy granite because i don't want to wash 700 kg of gravel. I did a test mold 2 years ago with epoxy and wash only 7 kg of gravel was a lot of work.
Today first batch of bolts and nuts came in to make all the anker points in the base and column.
About the height off the machine bed, im a tall guy (195) so i don't mind if my work space is high. I will try to aim this build on 100cm to 105cm now.
Stef