I found 2 food storage containers at Walmart one a 20 quart and one a 12 quart with the same dimensions around the perimeter. I drilled six 5/8 in holes for drainage in the 12 quart container, and lade a piece of hardware cloth on the bottom to keep the potting soil from washing out. (photo 1) There is a little gap at both ends of the containers, allowing for ventilation, no need for further holes. ( photo 2) . For the potting soil I use 50/50 peat moss and vermiculite. What I like about the near transparent container for the bottom is you can see root development and water needs. Photo 3 shows root development and beads of condensation which indicates adequate air space and water. Each container will hold 120 to130 cuttings and all seem to be doing well and pass the tug test. (photo 4) When I stick the cuttings, I will leave them outside in the shade for 1 week and then move them to the greenhouse. Six chambers fit on an 8 ft shelf very nicely. (photo 5). I also use a 24 in bungie cord to keep the two containers aligned. ( photo / image / picture from jbest123's Garden ) ( photo / image / picture from jbest123's Garden ) ( photo / image / picture from jbest123's Garden ) ( photo / image / picture from jbest123's Garden )
I have noticed that you are so very tidy. First that smoker attached to your grill; now your propagation chambers, all lined up on shelving, and even with a little stool nearby to sit on while you work. Have you ever thought of spending lots of time in Texas straightening out a messy gardener? Believe me, I know of a gardener ( ) who needs some neatening up!
If you have no objections I'd like to forward your post onto my daughter. It's just the kind of thing she'd be really interested in seeing.