My colony is in the scrounged bottom foot or so of a plastic 55 gal drum. It is on legs to raise it to waist height, I can toss a board across it as a cutting board to chop fibrous veggie parts to a manageable size. The larvae manure will be screened into a compost heap "soon" for a month now.
I have a very wet colony probably due to too many grapes and condensation on the metal cover that was supposed to be temporary four months ago I am having a fair amount of crawloff, but I'm not concerned as the colony is wall to wall larvae despite probable underfeeding to boot. I'm going to pull a bung on what is now the drum bottom as soon as I decide on a good filter. The waste is very fine and a fine filter will clog easily. I will probably try a scrubbing pad or piece of floor stripping pad (similar but an inch thick, less dense and two feet across). There is slight funkiness with the lid on, but not bad and tolerable (to me) even with the lid off. The alien fly issues I mentioned before settled out in a week or two of less food. The chicken breasts disappeared when I stopped feeding for several days. A tighter lid helped with the other flies. I think the old lid let the wind through (1 inch gap on one side) and it diluted the pheromones, the new one has just 1/16-1/8 gap where there is a gap at all. adding 40 pounds of weight to force it closed helps too. I stir the muck to aerate the bottom now and then. It's time to strain the ten inches of goop out, bury the bones and add the reserve 5 gallons of coffee grinds. At the moment I'm more interested in waste disposal and composting than harvesting pupae, though I'm sure the local wrens, frogs, ants and unfortunately mice are having a good time.
There are a LOT of eggs where the legs are attached, I scrape them off and stick them inside the bin. I usually see 2-6 adults when I visit the bins and sometimes they seem curious or territorial, though this may be attraction to sunlight reflecting off skin or light clothes and I am usually downwind and inside the colony scent plume.
I'm starting some experimental mini colonies as I noticed that my vacuuming is mostly finely divided organic material..cat hair, bob hair, skin flakes, crumbs, spilled cat food, cotton fiber from towels and the carpet,etc. So far they seem to like it. I want to see how much ends up as undigested residue before i toss it into the big bin. I may do one for the litter box too, but I'm not sure it's worth the effort of sorting compost.
The next project is to switch to a plywood lid with a prepupal collection ramp or hose.
I found half inch hardware cloth works well for getting the bones, stems and long fibers out, then 1/4 or better, 1/8 cloth salvages most of the larvae. Window screen clogs too easily, it takes way too much water to screen the waste through. It is good for washing the bugs off for donation to the local fishing buddy.
If this sounds like a lot of effort, its because I use a fine cut for my compost (it goes very hot overnight) and turn it frequently to quickly reduce it's volume, then pile batches aside to finish more slowly in bulk as recent studies have shown rapid composting techniques dont finish as well. Locally the debate is whether the sand or the road clay is more fertile because there isnt much else. I have a quarter acre of mostly sand.
Whenever I get it running drier again I may toss a couple of the local anole or skink lizards in and see how well they do. Maybe add a floating dock...
I am having a fair amount of crawloff, but I'm not concerned as the colony is wall to wall larvae despite probable underfeeding to boot. I'm going to pull a bung on what is now the drum bottom as soon as I decide on a good filter. The waste is very fine and a fine filter will clog easily. I will probably try a scrubbing pad or piece of floor stripping pad (similar but an inch thick, less dense and two feet across). There is slight funkiness with the lid on, but not bad and tolerable (to me) even with the lid off. The alien fly issues I mentioned before settled out in a week or two of less food. The chicken breasts disappeared when I stopped feeding for several days. A tighter lid helped with the other flies. I think the old lid let the wind through (1 inch gap on one side) and it diluted the pheromones, the new one has just 1/16-1/8 gap where there is a gap at all. adding 40 pounds of weight to force it closed helps too. 
