Correct. A band inversion is somewhat needed at a specified barrel length. But then again you lose performance and somewhat defeat the purpose of the design when you invert bands around another wheel in the back. Given, there are other benefits to the rear wheel set such as reduced recoil. But above all, my design is an alternative for snapping wishbones on a wishbone riser. A good challenge I recommend would be to pursue/create a new method for protecting the longevity of a roller wishbone. Alemanni does this by having a crescent riser with smooth edges. Couple other companies have done similar, but few have innovated.
It's been about 3 years of R&D into my optimized designs with an array of different manufacturing techniques. Of which a design patent is definitely in the works for. But I truly despise band guns to begin with and plan to pursue a new route soon. Simultaneously Ive been trying to steer a few others[manufacturers] in the same direction to bring some sort of standardization when the time and newer alternative is proper.