It would be a challenge to mill. You might consider making the side walls a part of the copper top (forgetting the acrylic). Also, you might consider simply soldering those posts in place. All you'd have to do then is drill a series of holes, and use a small copper rod (availability?) cut to lengths. Combine the two ideas above, and make the channel seperator a part of the top, and you've got yourself something that can easily be put together.
It'd work for you, but not for mass production. It's very personal that way...
