dont even have to sew panels on tbh, just rig it up differently, move the guy lines around and fold the ends over to make doors, or as in this case, i left the guy lines on the ends and crossed them over, if you dont like the idea of the guy lines pegged out like that, use elastic cord and secure the ends to an attachment point.
Pictured here with my 3x3 Tatonka, but works even better with my DD 3x3 as it has more loops around it giving a mass of set up options.