Wiring diagram help

Hi all, newbie, just bought my lovely 2015 VW transporter Gerty and have been painstakingly reading and planning my conversion. I am now at the point where I think I have a viable wiring diagram, but would love any one with the experience and time to cast an eye over it to let me know if I am completely delusional in my belief that I get how this works! Wanted to plan a basic system for weekends, with the option of adding in solar or shore input and an extra battery at some point for longer term travel. Any advice or criticism welcome, please be kind and happy travels :smiling_face: