Here's a little gem I ran across that I hadn't seen before: It's not much, obviously, but it's a Jeffries drawing I hadn't seen anywhere else, and I tend to watch for such things. If it's been posted previously, my apologies. The original context is YourProps.com. There are some other nifty artifacts there, as well. Enjoy.
It looks like the figure is using some kind of "thruster gun" to maneuver in space? I recall seeing "real" concepts for such things for future use from back in the 50's and 60's, so it looks like MJ was doing his homework? Great post!
The spacesuited figure does look like a rough early sketch for the suits that were used in “The Tholian Web.” But how did Jefferies think the centaur could be done believably on a Trek-episode budget? Even Janos Prohaska had only two arms and two legs!
^It probably was just a doodle, or at best, a bit of a set dressing MJ was musing over? Maybe he was thinking the space suit was manufactured by a company on Alpha Centauri, and this was the logo?
I may be mistaken here but... Weren't the Tholian Web spacesuits off the rack? Meaning, they weren't designed and built for TOS they were a re-use of an existing suit, and then modified for TOS? Didn't they make an earlier appearance in the "I Love Lucy" Martian eps? Or some other program? I'm just saying cuz it's not as if MJ designed the suit himself, it was a re-use. Not that he couldn't have still doodled it anyway...
According to Memory Alpha, they were designed by Theiss for the episode. Whether that's right or not, *someone* isn't too fond of peripheral vision!