Need suggestions on making a C&C cage

[Fluffykins]

I want to make my rabbit (Fluffykins, I have a tendency to name my accounts after my animals) a bigger cage since he has very little room now (30 inches long, 17 across and single story) and I dont get to let him out to hop around much. I have an entire wall I can take up (Its a small wall between two doors though), with that in-mind this is the general size I can use: 69 inches long, 23 inches deep (I couldnt remember what to call this. Basically the size of the side) and 43 inches tall. I'd like to have it at least two story. Any suggestions (Preferably with pictures) on what it should look like?

 

[graceandsnowball]

we took two cages, cut a square hole out of the inside wire wall of both and added a tunnel.

 

[BunnySilver]

I am also making an NIC/C&C cage for my bun. I recently found this website that I am finding very helpful.
http://breyfamily.net/bunnycage.html