argh! i know how to do this, but i can't explain! OK, i'll give it a try, so, ok, you know how the grids we buy are meant to be made into cubes? so basically make 4 cubes at the 4 corners of yoy cage (if you made it rectangular or square, put them everywhere needed to insure stability if you didn't) and a couple in the middle and on the sides if it is a medium to big cage, and have the cubes be like part of the cage, right off the walls, a continuation of the walls, not seperate. be sure to make them very, very stable 'cause you don't want your cage to fall or anything. you also moght not need the whole cube, i do that for stability, but most people just do the two outside walls, and, obvuously, the top, since that is holding the cage. for the ones in the middle, just build cubes or like cubes without the top and/or bottom ( if you do this, be sure to have the sid(s) without the grids be the botton if you have one off, and the top and botton if you have two sides off, that way, it doesn't collapse) and put them under the cage.
Sorry for the long post, did you get the idea thoug? I think there's a couple of pictures in the picture gallery