Cat run from landing through high level cat flap

We Purchased a cat enclosure from you about 6 months ago, and have only just put it up last weekend. I wanted to write to you say how pleased I am with the product. At the time of searching for cat enclosure options, I considered making my own out of wood and mesh, but decided to go with the option of a proper enclosure from yourselves, and I am really glad I did.
 
The reason I bought mine, was because I saw people’s case studies on your website. I have attached a few images; we are looking to add additional levels, and also a ‘house’ at the bottom. The cat flap itself comes in from half way up our stairs, on the landing, and comes out half way up the house.

Mr Anderson