Use supports to support large opening near motor axle. I printed with PLA, it can take the weight of the motor.
3 top/bottom/outer layers.
Depending on what extruder you use, mounting bolts have to be at right length. With MK8 extrusion parts, I used 2 x M3x25, 1 x M3x20 and 1 x M3x6 bolts.
Whole thing mounts to 2 original bolts that hold those V-slot rollers. You can mount it to stock nuts, they thread just to hold it all together. Installing little longer bolts may be in order, I will install them for sure.