Attach the stepping motor to the pump case.
Attach the bearings to the rotor. There should be two bearings per arm of the rotor.
Attach the rotor to the shaft of the stepping motor.
Pass the tube between the bearing and the case, and cover it with the lid.
Insert the tubing into the end of the syringe. If you can't mount it directly, you can use a larger piece of tubing as a coupler.
Attach the syringe bracket to the case.
Attach the pump to the base and you are done.
Make five identical ones and attach them to the base and you are done.