This allows the end user to decide what level of infill they want on their print. Each section of the shell is no longer than 9 inches, making it compatible with the majority of the entry-level machines.
I could be wrong, but I believe the most common bed size is 200x200mm which is just under 8 inches squared. Also, there's MeshMixer as well as other applications that allow you to cut STL files into smaller pieces for printing. Here's a tutorial on how to cut files with Meshmixer.
Edit: I cut it in two pieces and threw it into my slicer for my larger printer. Stats are with 20% infill and 3 outer walls as well as 3 top and 3 bottom walls. My printer is about 5-10% slower than the slicer thinks it is, so it'd be a 15 hour print per side, and use a little more than 1/4 of a spool of filament. I don't know what kind of spring loads it would handle, and my large printer is down at the moment.
Edit again: Forget the previous numbers, forgot to add support material because the internal structure would need it, and I had my speed set way too high for reasonable quality. Now it's like a 30 hour print because my printer is not very fast due to the huge bed causing more sway than typical printers. :\