That is for the C-Beam bundle - C beam, rod, wheels and plate. (new motor is extra)
I had to make new gantry plates to do it, and purchased some new custom plates for the Z axis, though they have recently come out with some stock plates that may do the trick.
I think spent around $250 on the beam stuff (X and Z) and $90 on the plates?
On my mod, I pretty much replaced everything but the y rails. (which I double the length of to 2000mm using the old x-rails) Having belts that long is problematic. I keep breaking them. (I think I am over tightening the belts) If c-beam kits came in longer than 1000mm lengths I would swap them ASAP. But to go to longer lengths you have to go with a thicker ball thread. Which will cost over $350 and require a new set of gantry plates. It is definitely a “must do” for me, but will take me a bit of time to design and fund.