I saw this on the Bay a couple of years ago and immediately thought Tri-ang SpaceX HAWK!
Called the CCV Bomber, its a superb looking things with its rear nacelles, double exhausts and swept wings.
I can't see a signature on the artwork but its a brill painting.
I wasn't the only blogger who noticed. The Unwanted Blog saw it too and combined with more fab artwork, the original patents and even a model have created a terrific post back in 2016
Designed in the early 70's it's too late to have influenced the SpaceX toy but could be related.
Here's a SpaceX Hawk and its larger green cousin The Tarheel/ Durham Nova:
For the real dope about the origins of the Tri-ang SpaceX Hawk and its American equivalent then check out Paul V's Tri-ang SpaceX Website: