The bird at right is a baby sticking his head outside the nest box. I tried to get a photo of his parents feeding him, but my camera isn't as fast as a flying swallow.
If you want to raise meal worms too, below are a couple of sites that give directions. Keep in mind, that I did well with one big container for everything. Just reached in to scoop around for the worms when I wanted them to feed the birds. They were always plentiful. I left the beetle and pupaes alone. The eggs were virtually invisible in the corn meal.