Have you read the geekhack TOS lately?
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I used a 6" mill vice and gang milled the bottoms and sides from a 1/2" x 0.72 x 6" piece of aluminum. That allowed me to do all but the top side in one large piece. I flipped the stock over and Tilted the head to make my bevels with it still in one unit. I made a deeper cut between caps to separate them and then angled the individual caps for the concave top cut. I angled the head to about 12 degrees and used a 3/4 end mill to cut the profile. The last milling step was the trickiest because the vise had only the thin cap walls to grip and I did distort one cap slightly by crushing it in the vise.I finished up with some sanding and sandblasting to even out the finish. I was hoping for a more textured finish but at least it's matte and fairly consistent.