I need a few more brush piles on my place and this layout provides some nice structure underneath them. Just sharpened the chainsaw blades so will get a few of these up in Jan/Feb. Need to kill some coyotes on same trips. Sure nice jumping a few cottontails when you are walking around. Seems like they are hanging in there around my place. And have a few coveys of quail so I do think the existing piles I just tossed together are also helping.
If you can get your hands on some pallets they make a great base for rabbit condos. Also help reduce the size of trees you need to drop for the bases if that's an issue. I like this document. Especially how it shows how to build in entry/exit for the bunnies.
https://fw.ky.gov/Wildlife/Documents/brushpiles[1].pdf
