You can achive Centurion with bigger strips than 15 since it`s about uniformity, for screen accaracy (and best look in my opinion) you should try for the smaller version if possible...since the arms are relative small limbs I would try to avoid bigger than 20 (front and back) However it`s like Randy said about the raised areas, the cover strip is meant to cover does areas as much as possible, original armor did not have those ridges on the biceps, armors that do are intended to use the overlap method, not approvable at level3 (Centurion), hence the trickiness to assable said armor especially if one got bulging biceps Forearms are looking great by the looks of it How big of a cover strip have you planed for the back of arms? And it can be a different size compared to the front, just curious