I am getting a 7 wk old flemish giant rabbit next week sometime. I want to make a cage for one. Should I do it in a 2x4 or a 2x5 if I can. The rabbit will be out most of the time while we are home. At nights or not being home the bun will live in the cage. I am gonna try to do a 2x5 cage size and hopefully I can since the guinea pigs cages took majority of the wall space. I just have enough to do a 2x4 or 2x5.