Elaborate cat flap!

Because we rent we couldn't carve a hole in the door for a cat flap so we had to take a window out and put it in there., so we can put the window back when we leave. But, the window is a bit high for him to jump up to so this is the Heath Robinson version of a high cat flap! He's so far got the going out bit but not coming back in. I'm waiting for it to rain.
Note the cosy little cat shed at the bottom. Spoiled rotten.