For your question on building and rooms, some people combine the hatching & the nursery in one place. Some also combine the dark cage (for pupae) and love cage (for adult) together.

Regarding the characteristics, you can pre-plan 4 basic places:

  • For hatching place, provide shade to keep egg moisture and keep temp around 29C
  • For nursery, provide shade for the larvae eating and not getting too hot
  • For dark cage, provide shade for cooling
  • For adult place, provide light

People use nets for the roof. If you want shade, use a darker color net. For light, use a white net. Take note of the ‘eyes’ or openings of the net if you use it in the love cage. Some growers have experienced the problem of adult flies ovipost on the net instead of the wood eggies. So they choose a smaller-eye net.

For the walls, you can use nets or hanging fabric.

For shading, in dark cage for example, you can also use tole (picture included) with some insulators to keep cool. It will protect the underneath from rain and is durable. For outdoor love cages, you can set up a greenhouse cover on the roof. This still gives light while keeping rain away. An alternative to greenhouse cover is thick small-opening net. It still provides light and prevents water from getting in..
In some love cages, people hook a humidifier system to give moisture to the flies. If you put moving pre-pupae into the love cage too (like some farmers do), you can build some lines of bricks inside along the four walls of the love cage so the pre-pupae won’t crawl out easily.

The frames of these structures are steel or wood. On larger scale, to save costs people use bricks to build the feeding units (nursery). It can be shorter (one line of brick) feeding unit or a taller cemented brick feeding basin. For the shorter feeding place, you can have a trench or ramp near by for the dark pre-pupae to crawl out for harvest.

For the space, the hatching place will not be very big because the newborn larvae are very small. So is the dark section. The bigger space is for the feeding (nursery) and adult place. In the feeding place, remember to leave the in-between walk way wide enough, so a wheelbarrow of food waste or some carrying vehicles can easily move through, also makes it easier for us human to work and feed them.

The separation is from the feeding place and the adult room. Because the smell from the feeding place can attract adult flies, making them lay eggs randomly there. Note that folks start out making small buildings and the fixing costs here and there pile up. So take that into account from your start.

If you want to expand in future, leave space for a waste processing place (before feeding the larvae) and post-processing larvae (into dried products).

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