Keep in mind a special condition of (non dynamic)components is that what ever you do INSIDE the bounding box (color, scaling, rotations), applies to ALL same components in the model. All changes to the external bounding box, (colour, scaling, rotations) apply only to that copy of the component. If you need to make a change to the details of only that one component (that would be inside the box, make it "unique" first. So if you are using different lengths of the same extrusion, scale the component from outside the box for each copy. If you want to change the wall thickness of all copies, then edit the component (inside the box). If you want to change the wall thickness for only one copy, make it unique, then edit it.

First project ; Model a desk out of 80/20, simply by getting the 80/20 components and sticking it in the components folder. I am planning to build a desk