Thats some great stuff RS- very interesting synopsis. I can see a number of great scenarios there already.
Ive been thinking about maps of the battle and and trying to get a handle on the scale of things. The First issue is to get an idea of what Earth looks like.
We know that 30,000 years in the future the Earth should be in the grips of another Ice Age, but Im willing to imagine that climate change has partly put a halt on that. The Antarctic Ice cap still exists though, so climate change hasnt been run-away. Im thinking somewhat bigger ice caps than today, but not a full blow ice age. The nice thing about that is it will allow for different, yet recognisable, continent outlines.
I could easily imagine that a lot of the water has also gone due to space travel: once people start hitting the stars the Earth's ecology is no longer a closed system and you would start shipping your water (as food and drinking water) offworld.
In the 40th millennium Earth is described as the greatest Hiveworld of all. I dont think that it should be a complete hiveworld in the 30th millennium- But it should be starting to go that way.
Now, onto the location of the Palace.
As i understand it the emperors golden throne is over Nottingham, so that would place the palace in the UK. Is the golden throne the same as the palace in the Heresy; if so that limits the location nicely. However, Britain is a fairly geographically dull place. Terms like Destiny's wall and Lions Gate makes me think that the palace is near to some rather large mountains.
Indeed, in the inquisitor novels I seem to remember that the palace was in the bowels of the Himalayan mountains.
So, I was considering setting the Palace at the centre of the Tibetan Plateaux. It gives a nicely contained geographical setting, would be an ideal place for spaceports (near the equator and high altitude)and, from the emperors perspective, is contained and easy to control. Plus it has that whole secret, shangri-la feeling.
EDIT- Black Legion pointed out I was thinking of the Astronomicon, so this ideas probably a non starter. Oh well.
What are peoples thoughts? Does this sound like Heresy

? Is the location already established? If anyone knows where GW actually located the palace during teh heresy, id love to know!
As too the scale of the battles- im thinking of making the maps at the scale of a small country. The spaceports should each be the size of a large city, so about the size of Manchester or Birmingham, while the palace will be bigger. Say about the scale of London, with a series of concentric defences. The palace will in itself be a huge, glorious Hive.
Again, thoughts?