Because anyone can make any creation, put it in blue, grey and black and call it Unitron. But to use only the pieces that existed at the time of the theme and to use design aspects that were used in that theme, and still make a great original creation...now that can be called by the theme name. Take a look at my Mtron and Blacktron II; those are the themes I do it best with.

i dont get why it has to be original. btw join my unitron group.

Thanks for the interest. The software is LDraw (ldraw.org), I find it to be much more professional than LDD. It is not in my Unitron section because not all the parts in it or the design features were used in the Unitron theme. For my theme MOC's, I try to keep them as original to the parts and design of the original models as possible.

is that ldd or something else? and why is this in your other group and doesnt say unitron assult rover?