That's a pretty good looking model. I still seem to struggle with the basic drawing process and all the different hold-key-combinations to get what I want. Currently my results give me incredible random abstract Picasso like things but they're far from a sort of decent looking building lolgood luck.
I just put together a start to the basic models I will be releasing... It's a model of the level 1 town center with basic textures. I plan to create all the incarnations of the town center and then all the highest incarnations of the buildings. Of course, as I said before, these will be basic graphics, good for general use (unlike the super-detailed ones they use in-game).
I will focus on my trailer itself first, rather than using my free time modeling as I don't wanna risk getting out of time (my trial version expires soon) but this sketch-up thing really is an interesting software packet which I will probably use intensively in the future ..
Good luck with the other buildings and a nice start so far