The hutch does look unsuitable, especially for the 2 larger rabbits that are in it. While it is nice that they can lay down, there isn't much room for them to move around or stand up fully. Not much ventilation or light either.
Is there any reason you are wanting a stand for the cage? Rabbits tend to do better if they can come and go from the cage on their own, that can be tricky if they are higher up. A cage that size isn't really big either, so you could be better off with a bigger cage or using a pen.