Hello folks, congratulations finding that megaship!
Concerning the Guardians, I've bookmarked most of the discovered ruins that have been found (aside from a couple), and it does look increasingly that they surround the Permit Locked Regor Sector.
At the centre of that Permit Locked Regor Sector bubble is a Wolf-Rayet star; known as Gamma Valorum.
https://upload.wikimedia.org/wikipe..._map.svg/280px-Vela_constellation_map.svg.png
Source on Wolf-Rayets:
https://en.wikipedia.org/wiki/Wolf–Rayet_star
Source on Gamma Valorum (Regor):
https://en.wikipedia.org/wiki/Gamma_Velorum
I suspect, just my personal opinion, this is the Gaurdian's Homeworld system. A Wolf-Rayet would certainly explain the odd things that happened to the Gaurdian's star if it was "dimming" and caused all sorts of strife on their planet. Important to note that the system itself has 4 stars (including the Wolf Rayet), two of which are locked into a binary - I suspect, again only my personal opinion, that there is, or was, an Earth-like around one of those four stars.
I've been researching the symbols that make up the Ancient Ruins' (not the patterns of the Obelisks themselves, but that of the "patterns" on the ground made of that metallic alloy), and although I'm still working on my findings, I believe the way ruins are represented by the patterns relate to a form of "System Map", "Galaxy Map", and "Home System" map.
Important to note: That's what I think each of these ruins mean, they are symbols for what kind of maps they use, but may not have a sole meaning or purpose in their distribution.
Also, many ruins and the "templates" as I dub them (the various shapes formed out of the metallic flooring plates) can be spread thinly or thickly, seemingly random, and it all depends on how many "planetary bodies" are in each system.
Hence, this new find, for example (with 5 ruins and the Megaship), is EXTREMELY lacking with Obelisks at each of the 3 Beta sites and 1 Alpha site (SOURCE:
http://imgur.com/a/JEmuI) (note; not the 5th Gamma) - this is because all the planetary bodies (aside from the "Home System Map" are thinly represented over 5 Ancient Ruins.
The "Home System Map" always has roughly the same amount of Obelisks and/or flooring plates at all times - it is pretty much the only consistent Ancient Ruin that only, sometimes, changes the metallic-flooring shapes (probably based on where you are in relation to the Homeworld).
As it stands, I believe the "Galaxy Map" or "Elmo" as some dub it, is a bit like the Golden Disc that displays certain stars (Neutron Stars) and their relative distance is compared to Earth (so if anyone finds it, they can find us) - I think the 3 consistent symbols that show up stand for, what I think, 2 Neutrons or 2 Wolf-Rayets or 2 White Dwarfs - or hell, maybe 2 of each - all are rare enough to be seen within 1,000-2,000lys of Earth or the Gaurdian Bubble.
I'm still deciphering the shapes, but here is one that is an example I've been working on:
And here is another example:
EDIT: Note; the ones circled blue in the below picture is what I think represents Neutron Stars, White Dwarfs, or Wolf-Rayets.
I'll keep working at this, as I'm sure it has something to do with the so-called "Clusters", but I'm fairly certain that if I can get more screenshots of more ruins and compare them to our Human "System Maps" (looking at you especially, Beta), then I think I may be able to do a mock up of the Gaurdian's home system - of course, if anyone has a screenshot of Gamma Velorum before it was Permit Locked, that would work best...
Fly safe, CMDRs o7!