That's a nice one, but it's frikkin huge.
You can cut the conduit to make the working surface area any size you want -- the default is 24" x 24".
GT2 Belt enough for any combination of 48" of X and Y axis length
The belts are thicker and stronger on that rig I'm guessing.
Based on the part description, it uses the same GT2 belts as standard i3 reprap printer builds.
Like many reprap builds, it uses 16 tooth 5mm pulleys.
Some reprap builds use 20 tooth ones. (higher speed, less torque)
Scott