OT: any chance you have or will do a write up on your set up and process? It sounds interesting!
This is pretty much what you would end up with when following official google cloud tutorials. Some time ago I started with https://cloud.google.com/python/django/container-engine. I still run django based on this tutorial in addition to a few more things.
Some things like minikube are somewhat bleeding edge, so maybe they are worth describing.
K8s makes docker commoditized. For example, I am running GKE k8s cluster and I only use docker directly to take Dockerfile and produce an image. I push images to google replacement of docker hub - google container registry. I run things locally via minikube. If GKE would be using something custom to run images I would not even notice. I am close to the point that switching from docker to rkt would be barely noticeable.