Crawler Transporter

I've started to form the basic shape NASA's workhorse, the Crawler. I thought it was a simple box with bits sticking out, how wrong was I. The Crawler is a maze of criss-cross I beam girders and thanks to @MDBenson on Twitter, his photos showed how complex the placement for girders, rooms and equipment are. I've also found this paper model of the Crawler on MicroArtwork website, which has given me clues to how the Crawler is assembled.

I'm very attempted to model the Crawler completely, but I'll probably spend to much time online searching for details. Best to keep it simple...