[samuria]

Wouldn't it be easier to just decide on a UI library to be used for the project and use that instead?

[epidemian]

But that would not convey to the user the idea of the interface being a work-in-progress.

[mirekrusin]

You can stick “under construction” animated gif.

[worksonmine]

Design can distract from the UX and there's a use for very minimal mocks.