On the topic of cages, I have found it necessary from time to time to separate a ferret from a group for a few days (usually due to medical conditions). When this happens, I'm usually left scrambling to find extra cage space.
I've seen people who have split a Marshals cage in two, but have never been satisfied with how it was done as it essentially leaves each section with a single level. This weekend I got out the wood and power tools and created my own version of a Marshals cage split.
The materials used were all purchased at Home Depot:
1) 2' x 4' white (one side) Hardboard (1/8" thick) $4
2) 1" x 2" x 6' Pine board $4
3) 12" x 12" peel n stick floor tiles - qty 6 $4
4) Assorted cable ties $3
Total cost $15!
I cut the hardboard to fit the inside dimentions of the cage. I cut the pine boards into 2' lengths. At each end of the pine boards, I cut a slot big enough for the cage bar to fit into. I also drilled a hole in each end of the pine boards.
Photo of the finished pine board:

I then applied the floor tiles to the white side of the hardboard. You have to trim 4 of the tiles to fit (trick heat the tiles with a hair dryer or heat gun and then score them with a sharp knife).
The final step is to assemble it all, which is a little tricky. You have to take the cage part off of the base, put the hardboard in the base and resture the cage on top of it. This is the only way of getting the new platform into the cage. Then you have to move the hardboard around while installing the pine slats
Photo of the installed slats:

The slats are secured in place using cable ties (Aka Zip ties) - you instet the tie through the hole in the slate and then tie it around the cage bars.

Once all the slats are in place, you can move the hardboard on top of them and voila, you now have 2 cages for a very low cost! The end result is a cage that looks like this:

As you can see, each section uses one ramp and platform from the origial cage to create an eating area. A much better design than having everything on a single level.
Lynn