so your cage is 7 cubic feet?
Did you use a cage calculator?
What are dimensions of the base?
are those 2 large or small space pods?
Nice with the chew logs, chew toys and the house and the box. Nice litter box. Is that a large (ie 12 inch diameter) wodent wheel? - attaching it to the side of the cage is a nice touch. I am sure they will start to use it for all sorts of things
It looks like you put a lot of thought into your setup
as for items to add: hammocks which you said you are making, a tube attached to the side of the cage, food dish, at least 2 sources of water - at least 1 source needs to be a water dish that can not be upset, bedding and unscented paper based litter for the litter box - what types did you choose?
Btw babies are unable to get water out of a water bottle as their tongues are not strong enough to move the ball bearing with the water pressure behind it, although they may look like they are drinking.