My son and I painted a '67 Volkswagen in a booth similar to what you have constructed. We had a large shop area and were able to construct an 18'x18' area with 8' walls, ceiling joists. door, and lighting. A filter system similar to the one you pictured was on each side. We used four box fans mounted in the upper corners. The walls and ceiling were covered with heavy mil plastic and seams sealed with cardboard strips. It was for a one time use and very temporary as the lease on the shop was about to end.