Chad, hope it's not too late to post...
I like how there's one BIG Warden Semp in charge of all the little semps in the Tub. Good luck on your fun project.
I too had all my flats of semps on the floor of the balcony and decided they needed to Come Up! So the concept of "black plastic crates" (no sanding, no staining, no nails) has taken care of the problem but please excuse that it looks awful:
Flats on the balcony floor and now on crates closer to sunshine
