Okay so with how busy I am lately with school, loss of pets, puppies and we just found out somebody we know passed away, Moxie hasn’t been able to get out as much to run around. So I plan one making her a large home base. The first level will be about 56 inches long by 42 inches wide and 28 inches high. The next level will be 28 inches wide by 56 inches long and 14 inches high, although in most places it will be 28 inches high. The third level will be only 14 inches high, so it will be more of a napping spot.
Here is a pic giving the general idea on how it will be set up:

The first level will be extended out a bit, so instead of 2x4x1 it’s going to be 3x4x2 panels. But the other 2 levels will be made according to the picture, if not slight modifications.
Now here are the questions:
1) Should this be big enough for an 8 pound bunny, who does still have run around time?
2) The NIC cubes were Whitmor 6070-968-BLK black storage cubes, set of 6. (amazon) it seems people have used it to make those in the comments, but I wanted to know if it should be sturdy enough ect.
3) Those cubes are quite pricey considering I need around 52 panels and there are 23 panels in that set. (it’s $32) So I’d either need 3 of those packs or 2 of those packs and a smaller pack for $25. So really all I’m asking is if you know of a cheaper NIC cube?
(P.S. to the admins, feel free to make that pic smaller if it is too big. I don’t seem to be able to!!)
Thanks so much in advance!