Most guinea pig owners don't realize that there is another option for a guinea pig cage that is not only cheaper, but more comfortable overall for the guinea pig. A step by step tutorial with photos shows how to build a "C&C" cage for a cavy.
Rabbit Cage: Storage cubes, zip ties, PVC pipes to stabilize the shelves. boards to help stabilize the height of the cage. The shelves are plywood that have been varnished (so no accidents get absorbed), covered in towels secured with binder clips.