I have. Find a metal fabricator in your area. They will have an area dedicated to what they refer to as 'drops' (scraps that they sell for pennies on the dollar). You may have to make several trips over several weeks to accumulate what you need to build a single cage - or maybe not depending on the volume of fabrication that they do. It's much more expensive than hanging traditional wire cages. The angle iron will rust more quickly than good galvanized welded wire. The cages will be MUCH heavier than wire cages. Somewhat harder to clean/maintain. One good application for this type of cage is to build "kindling cages" much larger than single rabbit cages. An adult rabbit with 7-10 babies can live in a 24X54" cage comfortably until they begin to provide 'biology lessons'. This is really only practical if you are selling the kits before they reach sexual maturity as then you need to put them in their own cages anyway.