No on your color explanation. All of the colors used, were indeed availble for ordering, from ASC/McLaren. IF a person wanted a non-offered color, YES, they would make it. One (1) such car was made. The 1989 in British Racing Green (Truimph 1977) with Sand Beige Interior & Tan Top & Gold Pocket wheels and a 360 bumper-body-bumper tape strip in Gold Metallic. (So I was told - I have never eyeballed the car). Car was ordered by a former Ford Dealer, I believe now retired. Car is in Virginia or South Carolina, I 4-forget. I was told it's in showroom shape.
Sea Foam Aquamarine, Coral Red, Summer Tan, and other ultra low production number (or NONE MADE) were "normal" colors that asc offered.
(None was ever ordered in Summer Tan in1989).