SPACEX HAWK INSPIRATION - DOUGLAS X3 STILLETO

I recently stumbled upon the top pic of the Lindberg Douglas X3 model kit and noticed a resemblance to the Spacex Hawk and the Tarheel Nova (middle pic). The bottom pic shows the real Douglas X3 Stilleto amongst other X-friends. Noticeable similarities between the toys and the x3 are the pin sharp body, the mini wings and the engines open 'nostrils'. Obvioulsy missing on the toys are the plane's T-finned tail and the strange cockpit. But I think there is enough in common to theorise that the X3 is the concept behind the two toys.