I would hold off on the humidifier and start with changing the substrate (try cypress mulch) and covering some of the mesh on the top screen.
I did some googling and found this: http://www.neherpetoculture.com/enclosuresacc
You could order those and just place them over the screen to increase humidity. Would be just as easy to go to a glass shop and have them cut it for you out of glass or plexi.
You can certainly make your current cage work
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