Mizzcat, you think that you're confused now, wait until you discover all of the choices that you have as to the style and accessories for your piggie palace. As far as I know, cubes pretty much run 14-14 1/4" by 14-14 1/4". As long as you stay with the same brand, you'll be fine. I have used the Target brand of cubes and they worked well. For a 2x4 C&C, you'll need 20 grids: 2 for each end (4), 4 for each side (8) and 8 for the bottom. A top is easier to do if you use closet shelving, like Closet Maid. If you go to the home page, there is loads of help as to styles, how to do it and where to find supplies. The coroplast may be hard to find, but there are other options, also covered in the info found there. You can also buy a C&C cage with all the parts that you need on this web site. Be careful or you'll find yourself redesigning their home on a regular basis (it's addictive). Most of all, it doesn't have to be perfect. It just needs to be safe, clean and roomy. They need hidey houses and I'd put their pellet dishes in the corners and their hay rack along one corner to discourage them from crawling under the floor covering, but it hasn't been a problem with my boars. They prefer "above ground" hiding. Enjoy your little guys.