You will need to add supports to "Right Tool Rest Part.stl" in the recessed area for the bearing.
Be sure to print two side legs (the file called, "Side Leg-Print two of these.stl").
The EiBotBoard cover is optional. If you want quick access to the reset button on the EiBotBoard then leave it off.
As mentioned above, you will need to use Niko's pen arm, and follow his guidelines for drilling out and tapping a whole for a screw or knob to hold your pens.
You will need to tap the holes at the ends of the extruded aluminum rail to accept the M5 leg mounting screws.