I have a similar setup at home with a homemade dashboard. It's less polished and I've never implemented smart home (don't use any smart home devices) but it's calendar, weather, air quality and subway alerts. I also took the tack of building the UI with Bootstrap 3 so that it will run on any of my ancient devices like a gen 2 ipad air. I did it as much to usefully recycle old screens as anything else.

Home assistant is great even if you don't have devices. It can get data from all you calendars weather and such.