I would love to use melamine but the problem is that the humidity in time will ruin the rack and it is extremely heavy. The rack that I'm talking about is the racks that jason kbolkya uses for his hatchlings, but a lot bigger. I'm talking about the 5 level plastic shelvings you get at home depot. I like them because they are light, but they arent the simplest racks. Plus in order to make the plastic shelving worth to buy it is to actually have a 10 level rack.