Build A Rabbit Trailer Can You Tell Me How To Build A Rabbit Run That Uses Exit Door Or Floor Of Raised Hutch As Door To Safe Area?

Can you tell me how to build a rabbit run that uses exit door or floor of raised hutch as door to safe area? - build a rabbit trailer

We have increased 2 rabbits in a cage outside. I want to connect is to build a rabbit run out they can. My concerns are my cats, which is Bad, "" space on the floor directly below the high corner bath cabin on the ability of the roof of the cabin just a good size box access to exercise I feel guilty is not enough space.