That's a fine thought. I can work anytime after midnight. We are a small community and it's pretty quiet at night. I can keep a 3750 trunked back to the core that keeps key connections up while I rip out the rest of the switches. Downtime would be minimal. It's the core that concerns me. Thinking about it I can replace three of the distribution switches in that stack ahead of time and just have to deal with replacing the remaining layer 3 switch with the layer 2 MS410. I am probably making this more complicated in my head than it is. But measure 15 times, cut once...
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