After pH tested my Lumpy Channel block he suggested making a TEC block (
http://forums.procooling.com/vbb/showthread.php?t=9633). I was actually already planning it. I started drawing it up tonight. I plan on a single inlet and a single outlet. The problem with this design is it will be very restrictive but I couldn't come up with a better way to cover 50mm square and still maintain equal flow through the channels.
If the two barb version is to restrictive I can easily add a center inlet which would probably lower temps a little to but I want to stick with 2 barbs if at all possible for convenience.
So the attached pic is what I am planning on doing. The channel area covers 2.1875" square so it will cover a 50mm TEC and then some. The holes are 1/8" wide and 3/16" deep with the over all base being 1/4" leaving 1/16" from the bottom of the block to the bottom of the holes. The holes are connected by a 1/16" channel. Still alot of work to be done....