I know its a bit early to be talking of clans and clan bases, but wouldn't it be just awesome if you could set up your clan HQ outside the last city, as outposts for other Guardians, and a place to store your ship when you're on planet. I would love to have a clan HQ on Venus or Mercury, some place a little out of the way and maybe even hard to get to where all of my friends can hang out in their spare time.
Of course, it would be even cooler if a Battle Cruiser could serve as a mobile HQ, but I don't think I should get my hopes up for that.
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I think something more like a 'guild hall' in the Last City would make sense, it's the same on the outside for all players, but when you go in you enter a phased area for your clan only, so any players you meet are guild members. Not that the inside couldn't be really customizable, it just makes sense since the outside of The City is supposed to be dangerous (hence the epic walls)