hi!

My suggestion for you is this one below; very cheap, easy to fold up and does not take time for being removed. I have been using this method since when my male piggie arrived and the cage I had built before for my two sows (with correx and a plastic fence) looks now too little for the trio. I have no room for a larger cage, hence I decided to put an extension to the main cage at least for the night and part of the morning. In the afternoon my piggies live free into the kitchen, especially when I fold up the extension cage.
This extension is made of two runs bought on Zooplus:
Metal Run for Small Pets | Free P&P on orders £29+ at zooplus!
These runs can be joined together and when folded are flat. I use them also outside.
On the floor you don't need anything special but an old blanket, maybe a plastic sheet and a fleece; under the fleece you can put newspapers; the wet spots of the paper can be removed every day. I add some picture just taken; the cage and extension are empty because the hideys and other stuff are still in the kitchen with the piggies

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It takes two minutes for assembling all the stuff because, as you can see from the pics, I just roll the blanket+papers while the fleece is hung out to dry.
- the orange cage has now large holes cut on the sides, so that piggies can pass through, but you don't need it. have a glance only at the extension:
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below you can see the layers: there is a soft (old) blanket, a cloth (that is waterproof, but it is not necessary) and on the cloth there is the paper which absorbs the wee.
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Then I roll everything in only one minute and I put the roll under a piece of furniture

Actually I don't roll the fleece; I have done it now for taking the pic only (the "bed" is ready for the night now)
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the paper I use (also into the cage) comes from the supermarkets and is free