I get the skunk for skunkworks, the ITER tower, DEMO, and tokamak torus (although it seems to be totamak in the drawing). What is the creature doing the speculating, though? Is that supposed to be a spider in reference to the “spidey-sense” mention in the question? Is what looks to me like a strawberry supposed to be an apple to represent a spherical reactor? Has Signorino been hitting the deuterium too hard?
I think your identifications of the elements of the picture are right on.
As to Slug, a true artist takes his inspiration where ever it may come from. That’s probably also true of Slug.
It looks to me that every element in that fine illustration comes from a specific word in Cecil’s response, so it’s kosher WRT the time-honored conventions of a Slug Signorino illustration of an SD article. Totes legit.
ETA: Re the spider: only two things can have Spidey-sense: Spider-man, or a spider. Kevin Miller is not Peter Parker, and we don’t need the Straight Dope getting in hot water with the Marvel Comics juggernaut, so depicting the one pondering “fusion in a decade” as a copyright/trademark violation is absolutely not gonna happen. So, by elimination, a spider.
I figured it was supposed to be an anthropomorphic spider from the ‘spidey sense’ thingy you mentioned (or a really disturbing walrus). At first I thought the skunk was a chipmunk for some reason, then I saw the tail and stripe and it made more sense.
Now be fair - commercial fusion power has never been a decade away. It has always been 40 years… In fact I knew a guy who started working on the ZETA device in 1957 and retired from working on JET in 1997 who had spent his entire career with fusion 40 years away