first of all, how many waxies are you planning on having in there? they're my favorite frogs by far

as for enclosure - they don't need all screen enclosures, in fact I found that those types of tanks are more complicated to keep waxies in because it might be difficult to provide necessary temps. The best enclosures are big screen top ( or side on your case) and glass. so by any means go forward with your idea, but keep in mind the key here is low humidity ( 10-30, max 40%) and good airflow. Don't go too crazy on set up itself, that I'm sure you're itching to do given your experience with darts.