Here are all Parts you need to assemble the truss.
Connect Part_X_3, Part_X_4 and Part_X_5 by using a M3x16mm screw and a nut.
Take Part_X_3 two times and place it as shown in picture 2.
Attach Part_X_4 as shown.
Insert Part_X_5 and fixate it with 3 M3x16mm screws.
Repeat steps 1-4 nine times.
Connect all nine parts as shown in picture 5.
For the last step mount the supports (Part_X_8) on the truss.