I love the potential of this theme! One thing that it introduces that I’ve struggled to have fine tuned control over in the full site editor is a cover image background with header template part on top. The way the cover block works with elements positioned within it constrains how you can set the styles of your header template.

For instance, you cannot (as of now) stretch a header template with site title and navigation wide or full width on the top of the screen within a cover block. It constantly constrains the header template to a restrictive width. Some layouts are just not quite possible yet, but Wei does a great job of coming close. I think a transparent header over a cover image would be a very popular pattern for site builders that is currently limited in the design tools.