Question for the "Experienced"

This trailer intrigues me and might be able to be bought right as it is set-up currently for a single use, unless.....................I could make this work as a tiny camper. As the picture shows this huge opening for concessions and a rear 32" door. The 32" rear door I actually like........How do I make this huge opening in the side work for me? Any ideas? The trailer is 6 x 12 with an additional 6" of height. Thanks for your help.