The reason I posted is because 'Grid system' was added just a few hours ago. I can't find any other info regarding same.
Ironically, I have just stopped using CSS Grid because it was too hard to maintain the sites when using Bootstrap, the darn thing (Bootstrap) has a too great a dependency on Flexbox.
Fingers crossed.
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I can remember working out a flexbox grid system that I based on the old Dw FGL's a few years ago, but the more I looked into 'implementing' the less point I could see in doing it, as flexbox I found was better suited to actually allowing the layout to flow naturally.
Sometimes trying to control a layout to much is not the right answer, especially where flexbox is concerned. Still it was all part of an interesting learning curve for using flexbox.