PJ, it looks like you were able to figure out the drooping issue? What was the cause? It doesn't sound like it was the temps. Maybe the box needed to be aired out from the fresh paint fumes? Also, do your buckets have good drainage? Are the white buckets completely opaque, or do they allow light through the sides to the roots?

Sorry to hit you with all of the questions, and my eye is not that experienced yet; but, I thought I would throw them out there anyway.

I'm looking forward to some good pictures, my friend!