To assemble it you will need a m5 threaded rod(any length you want) , two m5 nuts, 4 standard skateboard bearings, 4 m3x25mm screws with nuts.
Just put the rails on the m5 threaded rod(there are nobs and holes you need to look out for), then put one m5 nut on either side of the rails and tension them down.
To assemble the guide, put 4 bearings on it, then put the other half on it and screw them together using the m3 nuts and bolts.
The author marked this model as their own original creation.