Hi there, great to see these recent developments for wider themes, my users and I will thank you!
So it looks like pacharanero’s theme component is probably cleaner and more modern than @Alex_P 's version here? (Similar thread: Increasing post width with CSS?) I do really like @Alex_P 's option to increase the post editor width to full screen.
I’d also like to make the homepage Latest / New / Categories lists quite a bit wider too. To do that it would seem sensible to reduce the extreme left and right margins, if possible to the same width as in the topic view for consistency.