The cage looks great! It's all uniform and nice-looking. I'm sure they're very happy in it!
I have a question about the fiddlesticks on the upper level. I am considering having something similar on my upper level, but I'm a little wary that the boys might climb up on them and dive/fall off the side all the way down...is that crazy? I have half of the cubes as a railing on my second level as well.