Hi Gordy:
Sad news indeed. I vividly remember receiving the issue of Flying Models in the mail that had you holding Mark's Two Much twin on the cover. That cover photo sparked a lifelong interest in twins and was what eventually led me to design, build and fly them. He inspired so many without even knowing it.
There is a line in the Jackson Browne song, "For a Dancer" that certainly applies here: "Into a dancer you have grown, from a seed somebody else has thrown. Go on ahead and throw some seeds of your own. And somewhere between the time you arrive and the time you go, may lie a reason you were alive, but you'll never know."
I didn't know Mark personally, but the seed he sowed certainly took root with me. My prayers are with his family, and with you, my old and dear friend, Gordan.
Bob Hunt