I have the Mindstorms NXT 1 kit. It includes a printout of the first robot model building plans. The plans for several other robots (e.g. the scorpion bot) are included in the NXT software. However when I run the software, everything works, but it does not display the building instructions, only the programming instructions. Can I download those plans somewhere?
Official building instructions for NXT 1 models can be downloaded here: http://mindstorms.lego.com/en-us/support/buildinginstructions/8527-/T-56.aspx
This link seems to have the original building instructions, Alpha Rex is confirmed. http://www.learningfun101.com/2013/02/lego-nxt-instructions/
You can get almost every building instruction directly from lego - just type in the set number.
8527 (which seems to be your set) there are 7 downloads available (note: I'm not sure if the ones you're looking for are contained, because I don't know the set - but they should be there).