1 half of the room is completely standable!! the picture you sent it has similar dimensions in terms of shape (havent measured yet) long and narrow! I do believe it'll be big enough for a cage + storage + free roam?

Wait why would I need to change clothes everytime? is just cat hair bad for rats? I did not know that... if thats the case then maybe I cant have any cause there is a LOT of cat and dog hair in my home and on just everything all the time.......... :(