Ok I no this is a noob question.... Are nodes the flowers that start between the branches were you tell the Sex... Or How many layers of leaves the plant has???
Alright, just read this whole thread from the start! I LOVE your stealth set up man. Very good craftsmanship.
To answer your question real fast, the nodes are where you should look. you'll see hairs if its a chick and balls if its a dude. You'll have time between the males making themselves known and when you gotta kill them so they dont knock up your ladies, so don't sweat that.
Some general thoughts I've had while I read:
I wouldn't let the stem come that far out of the seeds during germ. as soon as the white tip shows up, I plant. I've heard doing otherwise can stress the roots, but it looks like it wasnt a problem for you.
Also, I would steer away from clear containers. You aren't using them now but i noticed earlier you were.
I would put the carbon filter on the inside on the inside of the dresser, and have a fan sucking air thru it and pushing it outside. This way you do not have to have something sticking off the side of your stealth grow.
I like what you have done with the paint and the light fixture. If you get the 26w bulbs you should have enough light for some nice dank nugs!
I would start flowering when your plants are 60% the height you want them to be. If you build a screen and then twist tie the stems you can get them all to a certain height before you flower. it will take a lil longer but your yields will be better and the nugs will all get plenty of light! As a person who likes to build stuff, this would be a fun project to undertake.
I'm not sure what fans you have going on inside the cabinet, but i would put in an extra one if you dont have it to move the air around the plants. if your plants are dancing
then you will get great results!
Finally, try to keep the humidity between 40-60%. especially for flowering, a humidity over 60% can cause you some serious problems. You can get away with up to 80% if you have good air movement tho
Your grow looks great though man. Plants are healthy, your set up is good, and you obviously have the passion
Sub'd and good luck! We both started round the same time so Im gunna be tracking your progress