I posed this very question to someone at Palisades back in the day... I don't think it was Ken Lilly, it might've been Mike Horn? Anyway, I was wondering what the scale was, so I could track down a Luke Skywalker of the correct height for the Mark Hamill episode.
Surprisingly, the answer was that they considered the toy line to be in scale to 12" dolls. The argument was that if you compared the size of Kermit's head to the size of the doll's hand, they were about the same size.
I can kinda see where this makes sense, but the scale issue gets really tricky with the Muppets, because whenever they're in the shot with a human, they're technically 'floating' a bit too high off the floor.
With action figures, the 'true scale' has to be fudged yet again, because you can see the entire character head to toe.
Here's a photo that I took a while back, exploring which scales worked best...
http://threads.rebelscum.com/imagep...hp?file=107997&imagewidth=637&imageheight=553
You can see several differently-scaled action figure lines alongside a Palisades Kermit.
http://threads.rebelscum.com/imagep...hp?file=108006&imagewidth=741&imageheight=591
The Andy Kaufman (a wrestling figure) actually looks the best scale if you're just comparing him with Kermit. But put the Andy figure in the upstairs part of the backstage playset, and he's way too tall for the dressing room doors.
http://threads.rebelscum.com/imagep...hp?file=107998&imagewidth=733&imageheight=596
This Tobey Maguire action figure is a really nice height for the dressing room doors, but he's clearly too small next to Lew Zealand.
After conducting these tests, I read somewhere that the doors on the actual backstage set were built at something like 5/6 normal size, so they would look okay with the guest stars but not dwarf the Muppets.
One of my favorite 'guest stars' was a George Burns doll who was only slightly too large...
http://threads.rebelscum.com/imagep...hp?file=125281&imagewidth=706&imageheight=504
I fudged this shot by having Gonzo on an 'apple crate'.
I also liked this extrapolated moment of George in the wings during Fozzie's 'Wotcher' number...
http://threads.rebelscum.com/imagep...hp?file=125809&imagewidth=931&imageheight=528
My buddy John suggested this shot and loaned me the figure for it... this Hulk Hogan was on a different (smaller) scale than the Andy Kaufman figure, so not all wrestling figures are equal.
http://threads.rebelscum.com/imagep...hp?file=124702&imagewidth=834&imageheight=459
But the Hulkster figure did make me think about his appearance in the Rocky movies, and that made me want to track down a good Rocky figure for Sylvester Stallone. I just haven't found the perfect one yet.
To sum up, eventually I stopped worrying about the scale. I can fudge it and fake it to make the shot work. Like this recent 'apple box' shot, where Kermit is actually standing on a wooden clothespin to make him seem a little taller next to Piggy...
http://threads.rebelscum.com/imagep...p?file=183077&imagewidth=1024&imageheight=768
I can artistically overcome the toy scale discrepancies. Either by doing something in-camera with forced perspective or hidden risers, or I can shoot elements separately and combine them together digitally...
http://threads.rebelscum.com/imagep...hp?file=177304&imagewidth=911&imageheight=646
... as I did in this shot where the Vincent Price figure was in reality twice as tall as the Scooby-Doo figures.
So I say, if you find an action figure of someone who was actually on the Muppet Show, and it's a good likeness and a decent sculpt, throw them in there. Don't worry about the scale.
Alex