Well, I've scoured the interwebs, and was unlucky in my quest to find that elusive picture of Joel behind the KTMA SOL.
Below is my best attempt to provide you, the people, with this photo: a pic I took with my phone of my TV playing 23 year old home video footage from the 1994 MST3K Conventio-Con Expofest-A-Rama of Kevin and Trace showing photos on a projector to an auditorium of jazzed MSTies. It's not the best quality, but hey, it's something!