Congratulations on your new panther. The house looks good. The only thing I might suggest is a few more vines and branches. Here's the cage I make for my cham a couple of years back to give you some ideas...
Take him to the vet and find out what's wrong with him. He's probably sick and that's why he's not eating and pooping. You also need to get the correct lighting and supplements. You need a tube Reptisun 5.0 UVB, a household bulb for basking probably 60 watt and you need 3 kinds of supplements...