Hey!
The base is 23" cubed. The top dust cover is 23 X 23 X 26. I sprang for the cover as I have an active two year old and it keeps him out really well!
I've turned the clock piece in the back 90 degrees so the face of the clock points forward. It actually fits pretty well and it may reduce the overall length a tad if you remove the symbiotes. I just turned it as I think it looks better and the clock isn't ridding up his rear. The angle still...