Any suggestions for rat coop platforms?

I now hav my cage... http://www.libertacages.co.uk/media/imag...
i need to build at least 2 full platforms i think in shield they should fall from the top..any suggestion on where...and out of what?
many appreciation
One of my rats have red 'scabs'...
Answers:    How about just some really big hammocks? Get a few used or cheap baby blankets or towels that are more or less the cage size and hook them up to the bars.
My guinea pig is bitting his foot?
I had equal problem, i used big rope toys that i sung around the cage. My girls are pretty good at catching them if they leak. I got my rope and ladders are petsmart. They might do platforms to but i'm not sure.
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