And plantlady, that's so cool you used to get lizard eggs! I wouldn't even know where to look growing up I have had many types of lizards and bearded dragons id love a terrarium for some of them, maybe I'll make a live terrarium for some anoles next or a snake?
I also bet you can buy terrariums premade I have no idea how much they'd go for. It really isn't hard if you buy a fully glass enclosed terrarium with light first. It'd be more pricey than just converting one. But then all you'd have to do is great stuff cut holes for pots then cocofibre then plant!