"Terrariums work fine for Chameleons". That's not an accurate statement, which is what I was trying to explain. For Adult Panthers, you shouldn't be keeping them in a Terrarium of that size. You would need something even larger. Is it possible to have a Panther survive in one if you provide enough effort, yes. But that can be said with just about any animal for any setup...doesn't make it right. Also, the link you sent says it all..."Anyway, these terrariums aren't for every species but for smaller montane species...".
Now, for another page that's pro-terrarium, here is an excerpt that also supports the earlier advice I was trying to give you: "Adult male Veiled Chameleons (Chamaeleo calyptratus) or Panther Chameleons (Furcifer pardalis) require larger enclosures than are currently offered by many of these glass terrarium suppliers. Some sources, however, will custom build you enclosures of your desired dimensions, in which case adult males of these species could easily be kept in them. At large sizes, however, the enclosures become very heavy. If you want to read it yourself, go to
http://www.chameleonnews.com/10JulAndersonGlass.html
I know you had 1 Chameleon before and it lived 5 years, but that's actually not long for a Male Panther - that's just average with minimal effort.