Matt
Tamiya do 3 different G's in 1:35 scale,early,late and steel wheeled(you get infra red nightfighting kit with this one), all are pretty good kits to build. Dragon did do a couple( nightfighting and command versions) but they're oop although Lucky model lists one.Also these kits pop up on ebay now and then.
As for braille scale Revell did a G but it's fairly rare and I believe that Hasegawa also do one (or 2).
For references online try the following
Panther Gallery Panther G Panther Panther profile HTH
Pete