By the power of asking permission or opinion from nobody, I've been playing around with Commander X16 inspired phpBB3 theming. My thinking is to throw away pretty much all compatibility to proSilver and do the front-end from scratch as I think the UI of these classic forums is rather flawed, especially after responsiveness got forced in and it was solved too often by adding dropdown menus. And there is a lot of technical side stuff that is rather odd, wrong, and/or badly outdated.
The bad thing is that I have no estimate when, if ever, this work will finish. And probably all the existing mods are incompatible in one way or another. That's what happens when considering from scratch. But the good thing is that there is freedom to re-think the layout entirely and ignore limitations caused by backwards compatibility.
So far I've only worked on the forum header and footer, fonts, and recreating the butterfly logo as an SVG.
I can't embed images so here are some screenshot links:
The design is fully fluid, currently works pretty nice from 240px to as big screen as you can buy. There are some font rendering issues caused by subpixels, that is something that can be fixed but it is better to do it once the whole design is more or less ready.
The actual content area needs to be in lighter color than what the surrounding area is. That is because phpBB allows people to use any hex color value in text of their messages, so that is a huge limitation that forces the light message background. Don't know yet if I want to play around with light & dark mode support as it is some extra work and to get this anywhere useful I'd rather need to start solving the needs of the main content area.
The "Pet Me" fonts are great in that they support pretty much all known PET characters and also include modern useful stuff like the euro symbol. They even have a character for X16 butterfly logo! So far haven't asked from Rebecca if it is OK to use the font as a webfont (since I don't know if I even finish this work). The original TTF files are not compatible with browsers and no WOFF/WOFF2 converter works with them. But I found out that BitFontMaker 2 could import them, so I could then export them again (with a lot of trial and error for good settings).