Hi Jazz and Gav

Thanks for your suggestions I will definitely consider them, but to make it more clear I don't intend to use the cnc to finish the job all the way in 3D as I like to apply my personal touches plus since it is just 3 axes I would have to work on them anyway. I would need just a roughing step most of the time with my largest end mill since the material is quite soft and easy to finish by hand. Most important is that the whole thing is nice and square as often times I use a large amount of blocks. I am talking here about 1.5 tons of ice sometime.