I got a few ideas/suggestions while adding new custom blocks..
1) bundles css and js files
on next updates, it would be good if you could provide the source files to build: Yummy_skeleton.css, Yummy_skeleton.bundle.js and so on...
it looks like you made a few changes to the original libraries, and some of these changes conflicts with new blocks added, so it would be easier to trace and fix any issues..
2) elements.json
I've built my own elements.json file and I'm using a webpack plugin to merge it with the default one:
https://www.npmjs.com/package/merge-jsons-webpack-plugin
I think it could be helpful to others adding this to the documentation..
3) Image Library
I made a change to load thumbs instead of full sized images. It was a very simple change (using an open source thumb generation script) and it's very helpful..
I also changed the modal to modal-lg to be able to see more images.. and now I'm thinking about adding a toggle fullscreen button..
I think it could be useful to others as well..
