You can't possibly expect to arrange dry sand in a shape even remotely like a waterblock.
Even if you did, there's no way you can melt and quench the copper properly, under the right gas purge, without some very expensive equipment and a good load of skill. Copper is notorious for its difficulty in casting as well as cold-working.
The question I always ask myself when I come across ideas like this is "why?" I have nothing against people wanting to do new and strange things - in fact, that's one of my favorite things about this forum - but I don't understand why people would want to do things differently without asking themselves how it might make things better. I guess it's not a bad way of looking at things, but I still think it's strange.
A parting shot: why not just take a chunk of copper and cut away everything that isn't a waterblock?
Alchemy
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