Now the building starts, the wiki recommended starting with the extruder, but I'm missing a few bits (nichrome wire etc) so I decided to start with the x-axis. I started with the Z-axis bearing (the Z-axis guide bar runs through the two washers in the photo, while one of the threaded drive rods runs through a trapped nut).
I then moved on to the extruder carriage, you can see the extruder stepper mounted here (the black box).
Time for the other Z-bearing assembly, here you can see the top set of 3 bearings that trap the z-axis. The x-axis stepper and drive belt were next to be added.
Et voila! One X-axis fully assembled, the action is very smooth and it's a lot more rigid than I was expecting.
Here you can see the extruder carriage, and how it sits on the supporting rails.