Cat playground for my two moggies and Bengal kitten

I am getting a lovely wee Bengal kitten in 8 weeks time but Bengals are quite hyper so he will need something to play on and burn off some energy. I looked at large cat trees, and they are absolutely ridiculous prices, for just one decent sized tree I was looking at £350 . I decided that my z shaped hallway would make a good playground so set about making it Bengal friendly. The whole project has cost me about £150, less than half the price of a cat tree, and I think will be much more fun for the wee