​Sounds good, although I might offer one slight twist.  I think organizations should be the higher bit not systems, doc etc....   So you have DEC, AT&T, UCB, MIT, USENIX, UI, OSF, etc....  Under AT&T you will have research and summit.​  Under UCB, you have CSRG, CAD, Ingress etc.. where you know things came from different teams.   Same for  MIT or the like.  BTW: the anal fixation / some of the arguments we have had, I also feel that Year of Distribution probably needs to be in the name if possible (certainly in metadata or at least an explanatory README).  For things like the USENIX tapes that's easier - because they were done by year.

Anyway - its only under these directories that then have the split of doc, systems, etc..   

If there is cross linking, you certainly can do a little if that makes sense.   But I think that It will be easier keep each collection from where and when it came to help cement the origin & time and make it easier for people to find things.

Clem