The original shuttlecraft as originally designed by Matt Jefferies was to have a more rounded look to it, much like the initial shuttles of the later spin-off series, Star Trek: The Next Generation. On his original design Jefferies commented, "Basically it was a teardrop thing, and the whole side panel, the outside door, would slide back, and you could just step right off on the ground. The seats were like bicycle seats mounted on each side of the keel." (Star Trek: The Magazine Volume 1, Issue 12, pp. 20) The model kit company Aluminum Metal Toys (AMT), however, which agreed to build the full-sized set model through their subsidiary ,"Speed & Custom Shop", located in Phoenix, Arizona and headed by Gene Winfield, as well as the filming miniature for free in exchange for exclusive modeling