This shows a 3x4 cage that has been basically assembled, and zip tied at every section in 4 places. Doing this took about an hour or two.

Note the large amount of large black plastic zip ties at each section. I will add image showing close-up so you can see how that works. These ties must be pulled as tight as physically possible. The larger the tie, the stronger the hold.

The cage has a MESH grid floor because we had them and thought they would make a more secure flooring.

The base to this cage can be seen if you look closely, it is designed so that there is a center pedestal that makes an inner circle that give the center of the cage enough stability so that I can actually climb into the cage without it collapsing.

Final steps include:
adding additional grids on the bottom so that the base is firmly attached to itself, and the grids won't move around when moving the cage. Basically this means creating a large "O" shape around the outside of the cage on the bottom.

Using a pair of wire cutters to cut the ends of every single zip tie.