Why are they showing us how to build a chasis?

[J Flex 188]

Exactly as Bharat said, for some veteran teams this pre-assembled chassis could serve as a prototype bed for mounting the new sensors and running it witth the 2005 RC for teams without the benefit of an older robot. At the same time it also provides a solid test bed for the first days or week of build season allowing many different configurations of wheels and the like to be tried. Also it serves to teach new members the fundamentals of what a solid base should look like (in relative terms). Although its small, for some teams having accomplished as much in the first few days is a big step forward.