I realize that, and if you have room for a 6x2x2 enclosure, go right ahead. I for one, don't have that much floor space. I will trust the people who are the most experienced in the field, such as Rio Bravo and many others, and they say a 4x2 is perfect for an adult female and a 3x2 is fine for an adult male. Males, if fed conservatively, stay around 5ft. They should be squared off, not round-bodied. I'm sure my girl would get to be a fattus if I let her, and that's why she only gets fed a 2.5lb rabbit every 3-4 weeks.