Wiss, I dont recomend going to a machin shop to get just one block made see my artical on
www.custom-cooling.com about the cost of blocks.
What I would do is see if you can find a school (like was mentioned) or get to be good friends with a guy in a machine shop.
Or find someone that has the CNC machines that can do it for you.
I would help you, but I am totally swamped.
Also trying that on a drill press I beleive would be way to hard. I can almost garantee that for the hours that you put into it, it would not come out to your liking.
I really hope that you can get it made somehow, as I would be interested in seeing it. Also, that is going to be some seriouse CAD work to get the drawing right.
Good luck my friend.
You might also see what some of the home machinist might charge you for a block like that. You might have to go for aluminum as copper is a bit harsh to machine on a desktop mill.
Check out the MAXNC news group on yahoo.
http://groups.yahoo.com/group/MaxNC-users/