I recently discovered BLOCKS
, a DIY playhouse of white cardboard elements -said to be surprisingly strurdy- that you can assemble again and again to your (and your cats'!) liking. As you can see, the kickstarter campaign went so well they almost surpassed 5 times their initial funding goal.
I find it ingenious and also a very good deal (their basic kit costs 40€ + 15€ shipping to EU) considering the price of most cat playhouses (it's of course made of cardboard, but still, I'm sure it will be a hit! )
. Unfortunately the kickstarter campaign is over, but you can still pre-order it at the french equivalent KissKissBankBank
Note: for now, they only deliver to France, Belgium, the Netherlands, Portugal and the UK, so you'll need to work around that if you want to order it.