I have just finished making a fork of Daniel Friesen (Dantman's) port of the Monaco skin for anyone who likes using the skin but has found it has display errors when used with certain extensions (like WikiEditor), especially on the latest versions of MediaWiki. This forked version has several edits to make it more compatible with more recent versions of MediaWiki, mostly CSS tweaks and a compatibility patch for users of the WikiEditor extension.
I'm not very experienced with GitHub, but I have tested the project linked below and it works fine for me, so I would like to share my fork with the MediaWiki community:
https://github.com/Arcane21/monaco-port
I hope it was not inappropriate to use this mailing list to share this, so if it was, I apologize, but I thought this might benefit the MediaWiki community, and I hope it proves useful.