Some progress with this - here's the block that holds the pipes with decorative engraving done with 0.8mm and 2mm tools:

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Also done the copper block that sits on the processor, but no photos of that yet.

Cooling block for motherboard and graphics card to follow shortly ... need to buy some 6mm (or so) aluminium. I'll probably get this as it looks useful:

http://www.aluminiumwarehouse.co.uk/...duct_info.html