Casting would be to expensive(way to much power to melt the stuff!!!), but so would the day to mill the thing.

I like it!!! maybe make one without the pins first and if it shows promise try one with. But damn that is a lot of small milling to do.
My poor mill is getting it's @$$ kicked with the little Copper block I am making now. Something got thrown off balance and it is vibrating without even milling anything.

Just about got the block done though.