Isn’t that what is called a “dumb waiter”?I guess weight is not a problem! You really will be spoiling yourself.
Have you got a lift planned for the pups to get to tbe sun deck?
Back in the 60's (you may have heard your Mum speak of those times). The posh "big houses often had a 'hatch' type cubby hole in a dining room wall where food or crockery could be transported between floors and thereby kept hot.
I.e. between the kitchen below stairs and tbe diing room on tbe floor above. Back then, I believe these things worked on a pulley system.
I am sure with tbe wonders of modern science, you could rig up something similar to transport Jade and Milo up and down to the sun deck.
It could also be used to carry ice and bottles of wine/beer.