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DP you will need an insulating layer between the hot and cold sides, I used a disk of 3mm thick perspex for the job. Cut out the square holes for the peltier(s) to sit in, and it does a stellar job of keeping the two halves separated. It's *just* thinner than the peltiers, so there is still guaranteed contact between the peltiers and the hot/cold plates, and you can run nylon bolts through from one side to the other to hold it all together. (Nylon bolts are better than metal bolts cause they dont conduct heat, but they're not as strong so you need more of them).
When you cut out the holes for the peltiers in the perspex also add extra cuts where the wires come out of the peltier, otherwise you'll have to bend the wires too much and the peltier may get damaged.
regards, Bird
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