Last metal building I did was an auto repair shop. Ran a 4 inch wireway down the center and brought all the branch circuits out of it. Worse part is the exit from the trough, either end up using a cornering ell, or bending back to back 90s with the second one being overbent to match the slope of the roof. One hole straps work well for pipes going perpindicular to the ceiling joists, paralell runs usually end up on the sides of the beams, with one hole straps for support. Tek screws are good for the thin steel, the heavier beams have to be predrilled to prevent breaking the screws.
