You may not have heard of a Play-by-mail/e-mail game called 'Beyond the Stellar Empire' (a UK-based version, which I played in briefly, is run by KJC Games (www.kjcgames.com), I believe this was based on an original US game which may still be running), which makes use of a lot of the features many people would like to see in the postulated EVMP.
Although obviously very different from the networking challenge you are all considering - a lot of BSE's data is certainly stored on computer, and a lot of actions are computer processed, but it's basically a turn-based game, and there's also a lot of freedom to take actions which only human admins could 'process' - what BSE did include was player-controlled governments and colonies (and all ships were player-controlled AFAIK) and, therefore, missions assigned to one player by another (my captain, for example, was given the money to upgrade his starting ship to a Deep Explorer, and given a mission to investigate a remote planet in search for some intelligent native life).
So, while it won't help much directly, looking into this game may give you a few ideas as to how to set up things like player-run governments and colonies and galaxies which change according to a) the actions of individual players, the strategies of player-controlled governments and c) the ideas, plans and whims of the admins. BSE also integrated resource production, trade, industry, construction, colonisation, etc. quite successfully as far as I was able to see.
Again, I repeat that this obviously won't be much help with the technical challenges of networking and programming a monster like this, but might give you some ideas as to how to organise a multiplayer science fiction universe so as to avoid it degenerating into nothing more than a realm of piracy and carnage.
Peter Cartwright.
PS. If an EVMP ever does get off the ground (which, no offence to those who are clearly putting an admirable amount of thought and effort into this, still looks as unlikely as ever), and you reach the stage of putting in an actual universe, please don't use that of EV or EVO. An engine as amazing as would be required clearly deserves an entirely new story of its own - EV and Override galaxies might potentially be added later (as was done with EV Classic, of course) - but something like this shouldn't be sold short.
------------------
... you wonder if their eating of the eels isn't a little too overt ...