Update: Well, in some ways these turned out better than I expected, but in most ways, much worse: the desktop 3D printer in my pod has a ton of jitter so that even the bits that should have been a piece of cake (like the ICs) came out pretty terrible; each layer has some arbitrary XY shift on the order of 0.1-0.2mm which is a ton at this scale. On the plus side, however, very little support ended up being needed to build the tricky bits- even the watchtowers stood up alright. If you’ve got a 3D printer that normally gives you pretty good results, I say give these a try and see what happens.
I’ll post again once the shapeways-representative prints come off the company printer :)