Ok, here is the 2 tec cooler for ya Halo. I am gonna put only thumbnails, as i uploaded the screenshots as 1920x1080 so you can see it the best possible.
Here is the put together design. Yes, the two tecs are to scale, 62x62x4mm. Hot side and cold side inlet and outlets, tecs sandwiched in the middle of the two "loops." The total exterior dimensions, ignoring the piping in and out is 50mm thick, 150mm wide, 75mm deep. The pipes are for 1/2" ID tubing.:
Here is the interior for each side. 1mm wide channels, 2mm high. The inlet is split to give the coldest possible water to both sides; paralell cooling rather than series.:
Here is the top for each side. Slots into the interior for each side. It has dropped down interior, to force the water at high pressure through the channels. It does not go down to contact the channels, but is 2mm above them. I didn't want it too restrictive, but it should still keep pressure up b/c of the small opening through and above the chanels, even though the flow is getting split to both sides. Also, the trapezoidal shapes line up with the inlet and outlets, to gradually pressurize the flow, rather than have it immediately smashed into the channels. It should help keep flow up a bit without compromising pressure.
Here is it all put together, but with hidden edges (basically interior design stuff) showing.:
