just my $0.02
my suggestion coming from my breeder(extremely reputable, so trust his words he has successfully bred and raised chams for decades) to me, I had a fogger (same as a humidifier essentially), and he told me that fogger are a passageway to respiratory infections so i had it pvced to look just like yours but sadly had to take it down for the needs of my cham are more important than the pride i took in building it. this does not mean do not use one, what I am telling you is just set the humidifier in the same room and a couple of feet away from the cage and humidify it indirectly. However i like your drainage, and as far as live plants go, I have seen many with and without do to my obsessive nature, I have read a lot on this hobby even though I am brand new, i feel i have a decent hold on whats to come, and some people do live pants and some don't, I can tell you that i was running tests on my cage for 2 weeks before i even got the cham and found that live plants do indeed keep the humidity up and stable over just fake plants. The drainage system you have looks great but again with running all the tesing, I found that even though my lower third of my cage is a glass terrarium, i have no issues with too much water and i hand mist with a home depot hand pump the top mister 2x a day plus a dripper all day and the cage is never creating severe puddles that don't evaporate over a few hours or so. i feel that only so much water can drop up on a leaf before the viscosity attracts itself to other drops leading to it pouring off the leaf anyway, so for a mister to be on for minutes seems like a waste since it is going down the drain anyway...My cham got lost in the mail for 2 days ... and by doing this my way ( and i mean my very experienced breeders way ) i pulled my cham from dehydration death to a full hydrated recovery, no showers or anything like that.