Although WAY beyond my limited fabrication skills, As I look at the profile, esthetically, the the tail appears to "dive" from the seat back much too quickly, so could I suggest that the "look" of the tail might be altered to extend a bit more horizontal to the rear before dropping off? Or at least not so dramatically turn down? (More like a '60s Formula car or Midget racer, although nor necessarily incorporating the "headrest"?) This is not meant as a criticism in any way of what you are doing, & I realize this would be enclosing "air"(much of the inside would be open, aside from the fuel tank in the front of the tail), & is strictly "esthetics" , but is only meant as an observation. Thank you.