Was inspired by a thread I saw over at OCN and decided to whip this up in solidworks.
Two Acetal tops and 2 Copper Bases with 10 TECs sandwiched between them. Should look something like this:
Basic model

Running Solidwork's FloXpress Analysis Wizard

Back of the baseplate, showing room for 10 60mmx60mm TEC coolers!

Exposed look at the water channels.