Man, that box of yours is amazing. Well done for a first time build. That's all beyond average capabilities I'd say. Subbed to this, looks like you could end up with a monster of a girl on your hands.
And don't fret about the over watering, it's gotta be one of the commonest n usually the first mistake we all make.
Looks like you're back on track again though.
If in doubt, just shove your finger right down into the soil. If it comes up bone dry, only then water it.