Hey Dan - Excellent idea here.
In general, I'm wondering how this design worked for you in reliably germinating seedlings? A few specific questions:
Was the humidity and temperature relatively consistent on the top shelf vs. bottom? Was there any drastic difference in germination times?
How has the heating/water system held up over time? (you mention the galvanic reaction above - is it worth going with stainless?)
Any other substitutions in materials you would have made in hindsight?
Great post!
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Results?