You get points for neatness, but as a cham enclosure, there are numerous problems.
The first, and most serious problem is that you are planning to house TWO chameleons in it. Yemens will not tolerate living in such close proximity with one another. They might be fine for a short while whilst they are very young, but once they reach the juvenile stage, they will need to be separated.
If I were you, I'd start off with only ONE chameleon, and see how that goes before you get a second. They are not social creatures, so you don't have to worry about them getting lonely without company...
The other problems are:
- cage dimensions: that cage size might be suitable for young chameleons, but you will have to get a cage that is orientated higher than it is wider for older chams. They need room to climb as they are an arboreal species.
- the basking bulb: it's exposed with
in the cage. The cham will try to get as close to it as possible, and in this case it will get right onto it and burn itself.
- ventilation: you have provide numerous vents in the cage, but that still might not be enough for the type of ventilation that chams require. Generally, screen cages are preferred over enclosed/glass enclosures, but enclosed cages do help retain humidity. You can search the forums - this point has been debated at length on here.
- foliage: you need more foliage/plant cover within the cage. Chameleons are a very shy/private species - they need a place to hide in order to feel secure. You need more leaf cover for them.
Also, you are getting a Yemen, and you should know that the species becomes omnivourous once it reaches juvenile age, meaning it will look for plant matter to eat, and there is a chance it might mistakenly eat the fake plastic plants you have placed in the cage. That can lead to all sorts of ingestion/digestion problems. Most keepers prefer safe (i.e. non-toxic) live plants in their enclosures.
- water bowl: not necessary for a cham, and it only collects bacteria. Chams will generally only get their drinking water from mistings and by licking up droplets of water from leaves that are wet by your dripper.
- dripper: it looks like you have the dripper nozzle suspended there next to the basking bulb. That will serve no purpose. You need to have the drips falling on the plant leaves, since that is where the cham will try to lick them up from. Now the drops are simply going to fall onto the floor where they will be absorbed by the newspaper/wood.
- substrate: do not use any substrate for a cham. It is unnecessary as they not spend much time (if any) on the floor of the cage. The calci-sand may just cause ingestion problems and will make cleaning difficult.
Newspaper can be used for simpler cleaning, but since you are going to be wetting the cage each day with mistings, it will have to be replaced very regularly.
What is that plastic box in there for?
You will also need accurate (i.e. digital) thermometers and hygrometers so that you can properly measure the temps/humidity in the enclosure. You need to be able to accurately monitor the basking temperature under that heat bulb. Too hot and your cham will be injured, too cold and it will not thrive.
Please read the articles on the following site to learn more about suitable enclosures for chameleons:
The Chameleon's Dish