Hum, you know... If you will be using an adapter plate between the stock mounts on the MDD and the new HS then you don't really need the new HS base to line up perfectly.

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The problem is it does need to line up perfectly in one dimension for the heat sinks which have bases only 50mm long. The distance across the two dies of the dual CPUs is a smidgen less than 50 mm. If the HS is not aligned properly, one CPU will be overlapped adn the other CPU will not be covered.

In the other dimension, placement does not require precision, because the die is 12mm long and the heat sinks are typically 37mm wide or more.

Not a MDD but perhaps interesting?http://www.macmod.com/content/view/21/193/

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What I can see of it looks interesting, but the html or java or whatever is written so poorly that there's a sidebar on the right side covering up the text, such that I can't read it.

Is there a better link?