Ferret Cage Materials? Or buying ferret cage?

If I get a ferret I figured it would be easier to build its cage then to buy one. I have an idea of what it'll look like. The top part would be its bed area and food area and the bottom would be a run. I would place the cage on some slabs so the ferret can't escape but as I would need bars and wood where am I meant to get the bars from. The closest city is Lichfield but I could go to Tamworth or Burton. If you have a ferret cage please say so and attach a link to the picture.