Sounds good! I dont have bicolours right now, but Daniel made an awesome enclosure, his thread with pics is posted here.
Main principle- temp gradient ( you got it with basking lamp), uvb 5. Air vent you got covered too, although big exo terras have enough screen top to provide ventilation.
Decor- a lot of branches of different diameter on different levels, foliage. You better go with silk plants, real ones will be crushed in no time. My sauvagii managed to completely kill pothos in a week, but bicolours are way bigger
water bowl, felt carpet or similar for the bottom, exo earth will get dusty in low humidity, everything else is risk of impaction.

you will need to go to a vet for meds. When you go get frogs ( port credit pets? ) look closely from all sides. If they wont let you be aware. Look for ulcers, nose rubs, look at the knees and elbows, look for anything out of ordinary. Look where a frog sits and what color is it. Happy waxy is going to be bright green and will sit high up. Check Daniels pics - his frog is a textbook heathy and happy.

Since you have more frogs - consider your new one highly contagious and get through strict quarantine for 2-3 month or longer depending in situation. At that time you will need to get a few fecals done, deworm, etc, I'm sure vet will help you with exact procedure or you can always ask us During quarantine always use gloves when handling, whatever you use for the cage should be never used for your other frogs, feed, clean, etc always the last.


Hope it helps