Building the first cage was a challenge and soldering the wires is not a very good solution. As more Cages are needed, an industrial approach must be used: The wood planks are maintained together with tape and drilled, then cut. The holes are perfectly aligned for the two planks, allowing an easier build. The drill is a brass wire.
A lot of cages can be quickly assembled. Next step: the doors. I will use cardboard instead of metal wire.