My new humidor cabinet

[Bondo 287]

Looks like a winner to me ! Nice Job

May I suggest - replace your first run of KL media in about three weeks. Or at least in a few weeks pull the tray and give it a sniff.
It will absorb any vapors off the fresh build like finish coatings or glues. You actually want it to do that anyway.

I wouldn't throw $100 worth of beads in there for at least 30 days.
And I use HCM