My version is modeled and render in AutoCAD 2004 with a few shapes modeled in 2008 since it offers commands not found before ver 2007. Those shapes are the deck 2-3 super structure and the interconnecting dorsal. Everything else I did in '04.
You can do those shapes perfectly with Autocad 2004.
The ones I can't do with '04 are the bridge superstructure and the interdorsal. Those are lofted shapes. What you see above was completely done in '04.