After putting a significant portion of Monday and Tuesday into the idea of putting the players into drop ships and having them land, I have to say I don't like the resulting game at all.
Placeholder graphics of how my dropships would have looked. I've landed on grasslands, you can see the light green area around it is actually where you can build, and the dropship itself is the square in the middle. Arrayed on the dropship are some components - the player could customize a 3x3 bank of how their dropship was built.
The main reason why is that it was a wholly unnecessary limitation. I already had given the players the ability to pretty much stake out several plots of land and freely build upon these lands. Enter the dropship, suddenly they can only build on where the dropship is, and now they have to go through this whole rigmarole of recalling their colonists, taking off back into orbit, and landing again just so they can manage an adjacent plot.
I might be able to just re-work the dropship concept, but just as likely I might just go back to the original concept of giving the players vehicles that move across the planet's surface instead.
Then again, it does offer an interesting break in the usual accumulation game model. For some reason, it brings to mind the feeling of finishing a level in an RTS, cutting through the enemy forces with your massive army, only start again with a small base camp in the next level. Obviously, building and establishing a reliable source of resources is a large part of a such a game, but it seems... disillusioning (if that's even a word) to just clear the playing field.
But at the same time, you're allowing for progressive evolution of the players' buildings and units, so the draw of "if I move and take advantage of the resources in this area, I can finally get [x] add-on for my [y]!".
Sorry, I'm being of no help :P
Good luck with whatever direction you end up going in :)
(Incidentally, I saw post of yours on the escapist forums. Made me laugh, because I read about one topic there weekly.)