I would suggest building the STC-1000 2-Stage Temperature Controller (AKA the ebay controller). There's at least one thread here on how to do it, and it'll only run you $45ish. It gives you control over both heating (with a 60w bulb) and cooling your fermentation chamber. As for drilling into your freezer, you could build a collar, not for having taps in this case, but just in order to have something else to drill through without permanently damaging your freezer.
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