There is quite a lot of plastic on them, arround the doors and sides there are plastic air vents. Also there is a thin(ish) wire mesh at the top which is plastic and the wire might get chewed through.
The terrariums are designed to hold creatures at quite a high humidity and are water tight, up to the doors. That’s why a large part of them are plastic. The back drop can come out and it is glass behind.
If there is something specific you want to see I can send you photos, as long as it doesn’t disturb the inhabitants too much.
Also I can put you in touch with someone who can build enclosures, made to measure, which look very nice. They are perspex, they could make small vent holes too small for teeth but you would need to check with them about scratching from claws.