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Thats the exact kit I used for my Dew controller, With the exception I also added a 10K potentiometer soldered to the existing on board pot so I could adjust the heat to maximum of only 500mA which is more than enough for my Strap that I used for my camera. The strap I made up of a couple of lengths of coaxial cable which I flattened with a hammer and lightly rubbed it with sandpaper to expose the copper... I soldered 16 390 ohm 0.5w resistors to this 18mm apart for my strap. this varies and I used a spreadsheet to work all this out, I think it's available via the DIY controller described on IIS.
I also have two other sockets ready for another two straps but haven't done these yet. The circuit is more than enough for all of this... You could almost say it's a little overboard, but works well...
As for interference I am not sure...
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