It occurred to me today as I was looking at power cords. Why not use a strain relief to attach the power feed directly to the control panel? They cost ~$3 vs ~40 for a twist lock male + female.
http://www.amazon.com/SKINTOP-Liquid-non-metallic-PG-Threads/dp/B005NB017I/ref=sr_1_1?ie=UTF8&qid=1339550912&sr=8-1&keywords=skintop
http://www.amazon.com/SKINTOP-Liquid-non-metallic-PG-Threads/dp/B005NB017I/ref=sr_1_1?ie=UTF8&qid=1339550912&sr=8-1&keywords=skintop
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