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Is there any mention of superstructures built in the Void in 40k, a la Ringworlds, Dyson Spheres, etc. etc. Or of Humanity having made use of them in the DAoT? I find the idea of an AdMech Ringworld extremely fascinating, and would love to write up a homebrew forgeworld/Ringworld, but don't know if it would jive with the rest of the lore surrounding the Imperium, or the kinds of archaeotech recovered by the AdMech.

You mean like this?

http://warhammer40k.wikia.com/wiki/Blackstone_Fortress

This

http://warhammer40k.wikia.com/wiki/World_Engine

is probably more the scale your looking for.

In the BrB they list a few of the planetary classifications and it sounds like, yeah, they have huge space stations and research posts that get lumped in with space fortresses. So having a big old space fort or super station isn't a problem for your homebrews.

I was thinking of giving my dudes a starfort, but a crappy beat up one.

There's also a massive fusion reactor composing the core of the Lucius forge world. The Adeptus Mechanicus tech priest claim credit for it's creation, but there's little proof of who built it or how it was built.

The old necron fluff had the outsider imprisoned inside a dyson sphere.

At the time, some of the younger 40k players thought it was something GW had made up (the "Dyson sphere" thing) - not knowing that it was theorised by Freeman Dyson, an actual physicist (and this influenced Larry Niven for his "Ringworld" stories as well as the people at Bungie who made HALO).

It is not a ringworld exactly but I do know that in the fluff Mars a giant docking station all the way around its equator called the Ring of Iron. So maybe another forge world had the same idea and built there own and the world underneath got destroyed but the tech priests managed to get it to safety first. Or something like that.

http://warhammer40k.wikia.com/wiki/Ring_of_Iron

 chromedog wrote:
The old necron fluff had the outsider imprisoned inside a dyson sphere.

At the time, some of the younger 40k players thought it was something GW had made up (the "Dyson sphere" thing) - not knowing that it was theorised by Freeman Dyson, an actual physicist (and this influenced Larry Niven for his "Ringworld" stories as well as the people at Bungie who made HALO).

IIRC, Halo was directly inspired by the similar but smaller structures in Iain M. Banks' Culture novels (although the name came from Against a Dark Background), so it's a bit of a secondary inspiration. That's why the Halo rings are so small.

The largest megastruture in the 40k setting is obviously the Webway. Following that, there's Commoragh and the Eldar Craftworlds, then the aforementioned ring around Mars. Port Maw is an artificial planetoid of pre-Imperial origin. Like the Death Star, but bigger.

There's structures like ring of iron, the Phalanx, thr large orbitals and space stations used by imperial oporations for various uses. They can be quite large and Dock many ships.

There are cobbled together, ainciant at heart and expanded on and on space stations that might date back for thousands of years like a orbital hundred versions city out there.

The fluff for one is not too much impossible.

Or a star Fort that grew into a space going city of sorts in orbit, its keep still the star Fort with vast add ons, extra levels and wings have grown as time passes and became a major trading hub say on Terra supply route etc.

Onw of the main navy headquarters for sectors might be pretty vast, like the ring of iron docks and Mantaims the many ships in the solar fleet.

The orbital space levels there will be vast with docks for everything up to giant mass conveyer, battle ships and largest warships in the fleet.

Maybe are base maybe have to Dock these. There 12km, long, maybe 2-3 high and such. So any Dock for them would likely have to be atleast there mass and bigger.

http://wh40k.lexicanum.com/wiki/Universe_Class_Mass_Conveyor

Ramiles Star Forts would probably count as superstructures.

Or how several planets during the Heresy notably Terra, (Calth was in the opening stages of one with the space docks) had 'Orbital plates' which were each probably the size of American states.

The mysterious fortress worlds come to mind (the planet sized constructs not the world classification). The Sabbat Worlds Crusade background book has some interesting details in them.

http://wh40k.lexicanum.com/wiki/Fortress_Worlds_(Segmentum_Pacificus)

The Horus Heresy novel Flight of the Eisenstein describes "bottle worlds" used by the Jorgall xenos race. Also something I think some real scientist theorized. Basically they're small planet-sized craft that are big spinning cylinders with word arrayed on the inside of the "bottle" benefitting from the centripetal gravity from the spin.

Either way, Garro and a bunch of Death Guard along with Sisters of Silence royally butchered one up and sent it into a star. As one does.

 TheNightWillEnd wrote:
The Horus Heresy novel Flight of the Eisenstein describes "bottle worlds" used by the Jorgall xenos race. Also something I think some real scientist theorized. Basically they're small planet-sized craft that are big spinning cylinders with word arrayed on the inside of the "bottle" benefitting from the centripetal gravity from the spin.

Either way, Garro and a bunch of Death Guard along with Sisters of Silence royally butchered one up and sent it into a star. As one does.

It's called an O'Neill cylinder
https://en.m.wikipedia.org/wiki/O%27Neill_cylinder

Yep, pretty sure that's the guy.

In the old fluff the C'tan Tsara'Noga or also known as the Outsider owns a genuine Dyson sphere.

Also the forgeworld Graia (take care with its lore, it have some canon conflicts due the videogame Space Marine) it's a traveling Ringworld. They techpriests take the resources of a planet until exhaust them and move on.

Zorninsson wrote:
In the old fluff the C'tan Tsara'Noga or also known as the Outsider owns a genuine Dyson sphere.

Also the forgeworld Graia (take care with its lore, it have some canon conflicts due the videogame Space Marine) it's a traveling Ringworld. They techpriests take the resources of a planet until exhaust them and move on.

I thought it was trapped in it?

I've always explained that as there being multiple Graia's. It's a big galaxy after all.

That's part of the concept behind the phenomenal Thorn Moons Crusade: https://ironsleet.com/tag/thornmoonscrusade/