Actually the save function in the Rhino demo expires after 25 saves, but if A9cad is working for you I'd stick with it. Rhino is 'spensive, my upgrade to the forthcoming version 4 will run at least $300. On the plus side I can feed stuff modeled in Rhino into a CAM plugin and make parts with it.
@Havok: cool, thanks for the link. I figured it had to be up there considering the overall size of the cab, and how big the marquee is.