Okay, I'm still experiencing some issues with importing from AutoCAD to Blender. Namely, it appears that only the edges are imported, not the surfaces! That's still a big step up, though, since I couldn't even get that much imported before. The solution was to save it in the AutoCAD R12 .dxf format, in case anyone's wondering. Also, today I totally redid the Stone Circle. I forgot to take a screenshot, but I did get everything uploaded onto Mediafire, so if anybody wants to take a shot at making sense of it, here you go.
Stone Circle:
[url=http://www.mediafire.com/file/hi3ckzzc5zm/stone_circleR12.dxf]http://www.mediafire.com/file/hi3ckzzc5 ... cleR12.dxf[/url] (this link doesn't seem to work and I don't know why...)
Solar Circle:
[url=http://www.mediafire.com/file/dhn5j52iyri/solar_circleR12.dxf]http://www.mediafire.com/file/dhn5j52iy ... cleR12.dxf[/url] (when I import this one, everything looks jumbled... not at all like it's supposed to look)
Altar:
[url=http://www.mediafire.com/file/eymcqmmm3k1/altar_roundedR12.dxf]http://www.mediafire.com/file/eymcqmmm3 ... dedR12.dxf[/url] (this one is more or less how it's supposed to look)
I'm planning on going to vote tomorrow and I've got a lot of schoolwork to do soon, so this is probably all I'll be posting for a little while. As always, feedback is nice.