I am a residential deck builder/carpenter by trade.
I have also created my own website for my business.
I have been using Piwigo for years and I think it is a great way to organize the photos of my jobs for potential new clients to view. (Bravo to all developers that made this possible).
For quite some time I have been trying to customize a theme that will work well for my situation.  I basically want something like the windows file explorer that has a tree, thumbnails, and preview pane.  I also wanted it to be mobile friendly since most of my clients will view the site on their phone these days.

I came up with this solution by customizing a Piwigo theme:
https://whitmerdecks.com/piwigo/index.php

I just could not get it to work the way I wanted.  I have now written my own custom front end that works the way I want.  This may not be for everyone as my images are pretty standardized in 4/3 format, but it works for my specific situation and it may give others an idea of what is possible.

You can take a look here if interested:
https://whitmerdecks.com/wdPhotoView/

Let me know what you think and if there are any improvements you would suggest.