I bought that, I think I got mine off E bay, I used to make a single storey C and C cage, my girls didn't chew it. They are plastic with no grid bits. You would need to get correx (I know you know that but let me explain) as the plastic is folded over a wire frame and can collect pee in them (lovely)
I didn't get on with a C and C, couldnt bear the mess but they worked as a frame and I now use them as run instead. They hold toegther well with the connectors and the long ones are tall enough that Guinea pigs can't climb over them
i will see if I can find a pic
xx