Linda Davidson published that design over twenty years ago. It still works good today for outdoor cages. A lot of keepers use that style for outdoors. It's biggest weakness is that it doesn't have a door. The second biggest weakness is that your chameleon must be trained to feed from a cup since the feeders will escape. Not sure how you plan to put lights in it either.
Not sure why you mentioned a candle? For breeding romance maybe?
He has direct sunlight on half his cage 12hrs a day no need for a light, it's plenty warm!! And it's a commitment but I hand feed them about 3 times a day 2 krickets and live meal worms every now an then. This is a perfect cage for my needs. Oh and he loves the Perch at the top of the cage so it's not hard to get him out.