If you mean the clamps, they were bought at a marine supply store. They are marine-grade stainless steel (no corrosion there!).
If you mean the hose seperator, they come from Billet Specialties
:here:. They are polished aluminium, and are made for car customising purposes. The ones I used are 0.625 " x 0.625" size, suitable for thick-walled 3/8" ID Tygon, but they come in a range of sizes.
As for the block, yup: I had it sandblasted, and then I hand-polished it to a shine.

Thanks for the idea, Coolermeister!