you can do plywood covered in marine epoxy with glass front doors. it's just as easy to work with as plexi is in the respect of drilling and so forth. and unless you wanted a multiple view enclosure (which can still be done), you'll already have 3 sides enclosed to make the frogs feel more secure. it's also easier to modify to ventilation, lighting, heat. and you can hide everything from view. not to mention you can finish the outside to match any decor......lol