Those gel packs or heat packs only hold heat for a predetermined amount of time, so unless your eggs are going to hatch in less than 60 hours, probably not the best idea. If you purchase an accurate, functioning thermostat for an incubator (which I hope you would) you won't have to worry about proper readings. There are a few threads on some homemade incubators in here, I still don't know how to link them, but the two that come to mind are JDouglas' cooler incubator and Roy Stockwells cabinet incubators. Both very different but from what I've seen, both work great. Good luck.
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