Nope, I used a manual mill to flatten the outer perimeter of the base, then I cut the channels using a bandsaw. I simply made a wood bracket to hold a cross-slide vice in a vertical position.
I then put the copper in the vice and cut a channel to depth with the bandsaw, moved the vice over the correct spacing, then repeated the process until I had all the channels cut.
It worked out really well and I managed to make the base after only 2 hours or total work.