Hi all, I’m new to the forum and I’m looking for advice from others…
My hubby and I currently have a three level NIC cage for two of our bunnies that we built about a year ago, it’s 3 tall X 3 wide X 2 deep. Recently we’ve decided we want to re do it. Currently there is the three levels, the floor level has their main litter box and hay feeder attached to one of two doors that swing open for easy access to fill. The second level doesn’t usually have much on it as they tend to knock everything down to the bottom level. And the top level is where they have their attached water bowl and where we give them their veggies and pellets.
Rather then using wood for the floor like we have now, we want to get the coroplast bases I’ve come across from a few other users on here. But I am wondering if we do the coroplast base can we get away with not having the bottom 6 grids? Will the 4 walls be sturdy enough to not have a floor attached?
The reason I ask this, is we were hoping to have the coroplast base on the bottom with the 4 walls around it, and to make for easy cleaning we can just lift the attached grids up and over the base much like most store bought cages only triple the size and half the cost!
Also, I’ve seen many people build their cages without the circular connecting pieces that come with the packs when you buy them at places like Wal-Mart, do you not need those for added support? Currently we are using those connecting pieces as well and a billion zip ties, but could we get away without using those round pieces and still have enough support without having the bottom 6 grids attached? 
Any advice or tips anyone has would be greatly appreciated!