The R panel is a fairly common exposed fastener panel. Any company that produces an "agricultural line" of roof panels produces a panel with the R profile.
For the hips on you octagonal shaped roof the easiest way to cover your hips is to install a foam closure piece between the top of the panel and the hip cover. The closure will conform to the profile of the panel to seal out wind, rain and insects. The fasteners run through the hip cover into the top rib of the roof panel and secure the foam closure into place. The same detail can be used on the peak of your garage.
Most of the metal roofing companies produce standard trim pieces that you can buy (hip caps, drip edges, rake covers, etc.) because most companies that install pole barns and other similar structures may not have a sheet metal break. Plus if you have the trim pieces on the job you can complete the details as you go.
If you have access to a sheet metal break, you can do your peaks and hips with a "z" closure and a hip cap that clips onto the "z". (see the <A target="_blank" HREF=http://www.pac-clad.com>Petersen</A> website, look at the Snap-clad details, these details can be modified to fit the panel you plan on using)
An octagon /w3tcompact/icons/shocked.gif is one of the hardest roofs to do. Can't go very far without cutting and tons of waste. The r panels aren't to bad because you can start in the middle of your roof section and work both ways so that you get your spacing correct. Just secure the middle so you can lift the one edge of the panel and slide the far right panel under the center panel so that it nests correctly, the left panel will overlay the center panel with the usual lap.
Thats alot easier than measuring, laying it out and starting at one side and working to the other (true standing seam panels can only be run in one direction), hopefully it works out that your seams line up.
I have a book from McElroy for a panel called the 5V crimp. This is the true barn panel. It shows every imaginable detail. The panel is different but the details are installed the same. Send me a private message or email with your fax number and I'll send the details to you.
Good luck with that octagon /w3tcompact/icons/smile.gif. If you have any questions feel free to contact me.
Kip