This was super useful, thanks.
When I look at PARA I’ll confess that my main thought is … is that it? It tells you to use four folders and then … what, the usual chaos? And so to be honest I haven’t really read much in to it.
But hey! The wonder of life is that we’re all different and that there are all of these different ideas to choose from. 
Some more thoughts…
What others including PARA might call ‘a project’ I think should usually just be an ID. It’s a task, really. I go in to this in the workbook: I think ‘paint the kitchen’ is just a JD ID. No way that’s a ‘project’ in my world. A ‘project’ is closer to ‘rebuild the house’, and even then I’d squeeze that in to an area.
(I’m in the middle of re-writing the first few pages of the site and the new 11.03 IDs will expand on this view of ‘what is an ID’.)
As far as archiving, I generally don’t see the need. The incremental nature of JD IDs means that older things naturally just fall away. Leave them there: there’s no need to ‘tidy up’.
PARAs ‘areas’ are closest aligned to my areas I guess?
And ‘resources’ are also just IDs in my world. Perhaps part of a larger thing, perhaps their own thing. But contained within a category, otherwise what is the thing about?