I would like to remove the backrest in order to have the kid ride up against me while she learns to be a passenger. She just turned 8, that's the legal age in California for street riding. I have installed a cargo box to serve as a backrest for her, and will be blocking up the foot platforms for her. If i remove my backrest assembly, is there going to be a huge gap, or just a small hole in the seat? Is there a cover available for it?