You can model the parapet cap as a roof and apply a fascia to be the drip edge

That's... interesting. Unusual perhaps but interesting none-the-less.

Yeah it might be worth a shot. One benefit of this approach is being able is to easily chamfer the end of a cope which to my knowledge can't be done with a sweep (not sure if an in-place void or void family would work as I haven't tested it) or fascia (which I'm also creating several of).

They are a mix of Wall Sweeps (when possible), with the mitered ends turned back the correct angles, and occasionally some In-Place pieces, using the same Profiles. Sometimes they all overlap by a few inches, but that means they have more than enough, and it all DOES get resolved in the field. When they were stone pieces (on the Arena) i used a bunch of families and actually cut them up. But with Metal Copings, that need to transition from one wall size to another (hard to tell from these screen captures, but a BUNCH of those walls are all different sizes), If you have them dragged to one another so they overlap in the model, technically, thats all they need in the drawings, plus a note telling them to miter them. And youve accounted for the space, dimensionally.

Not much point going to all the hassle of manually modeling them out of roofs, in my opinion. (Sounds like a great modeling method, though. If i thought it mattered, i would try that out).