While awaiting a response to see if we're talking about the right animal
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Maine coon cats are absolutely beautiful (my grandparents had one when I was younger and, while I still bear a scar on my arm, I was madly in love with that huge, fluffy boy) and I think it was wise to point out what breed you have considering the cage situation...
I think the person that suggested buying screen mesh is brilliant, and that was an excellent suggestion and possible remedy and should help you to get a suitable cage set up, without having to hang it! Someone mentioned that kitties will find a way to get what they want, and they were right. I don't think it matters how high the cage is hung, if they want it, they'll get it.
I have 3 cats and my cage is in my living room and sits about 20 inches off the floor. I also have a barrier going around the inside perimeter of the cage to keep poops in and paws out. While two of the cats have no interest in the pig, one does, so I've been working on training him to leave the pigs alone. Maine coons are known to be very intelligent, so perhaps some training will keep them from wanting to get at the pigs?
I'm not sure what sort of building materials you have available, and I know you said you don't have the kind of cubes we're talking about, but I'm sure if you look through the cage galleries, you will see a variety of different materials used to build a proper sized cage! I love the gallery because I can actually see what people are talking about instead of having to figure out a description in my head.
Also, I don't think having two cages together is going to be as beneficial as having a cage similar to what we use. Like what was mentioned, closet shelving is another brilliant solution to your problem!
I think having a look at the cage galleries will really benefit you and maybe you would be able to find similar materials to make your cage out of. Couldn't hurt!
ptimist: