Dakota - The Pro-Rib panels I bought at Menards.. in stock as 8', 10' in white and special order other colors and any size in 1" increments (I did that for the 10'4" roof pieces I needed for a wood shed I built a year and a half ago, worked fine and was 2 weeks lead time or so).
Finally got around to installing some of it, lessons learned:
Rolling scaffold a MUST. Rent at Menards for $8 for day 1, $4 each day after. Started on ladders and that was stupid, scaffold is king. Also, I grabbed a couple of CoolWhip plastic tubs, drilled a couple holes and tywrapped to the upper bars so screw buckets are within reach, one on each end. Never knock them over and always one-handable to grab more while you are holding a panel over your head.
Reverse fine tooth blade = good, but noisy as heck, throws shavings everywhere and leaves ragged edges (no different than a cutoff wheel). Just hit it with a file and it is cleaned up. We ended up using the cutoff wheel on the 4.5" instead, not as straight of cuts but mine are all covered and it was more manageable to use.
Put all your ceiling **** in LATER.

I had done all mine ahead of time (thinking I would
never do a metal panel ceiling) and it's hellish to cut around everything. I have 12-10" round ceiling speakers

eyecrazy: yes, overkill but I got a smoking deal on a school gym take-out 70V system!), 4-8" round heat vents, 1-12" HVAC supply, 1-8" black pipe chimney, 1 air shutoff for the hose reel, 3-1/2" conduits, 2-2" pipes (traffic light and TV mount), 15 outlets, 4 ceiling fans, garage door bracing, GDO... it *****.
If you foolishly did ceiling mounted stuff first like me, the tools to deal with it all:
Worst ones were teh chimney and 12" supply, had to cut the hoels and then cut the panel to fit around them, so I have like 3-4 overlaps within 8'.. panel end, then chimney cut, then supply cut, then panel end again.
To trim out the exposed rib ends for things like outlet covers and speaker grilles, I bought a pack of "
Tuftex 5-Pack 1-in x 36-in Square Cross Link Polyethylene Exposed Fastener Closure Strips" from Lowes. It isn't the shape of the panels but you want individual humps not full strips. This one gives the most humps for the buck

. I cut the individual humps out and tuck them into the exposed ends, really cleans it up and gives a more finished look.
In stock 8' panels are convenient to buy, but a ***** to put up since I have 2' OC trusses and you need overlap so after panel #1, you have saggy ends without hitting a truss. I bought a bag of 500 white head steel 1/8" pop rivets (cheap on ebay), and am riveting any saggy joints on the ribs and mid-point between the ribs. A little time consuming but cleans up a lot and nearly invisible from the ground on my 10' ceiling.
Cord and plug for the ceiling lights works fine, and "
Ty-rap mounting head ties" such as teh T&B L-7-50MH-9-C screwed in with 1/4" selftapping sheet metal screws work good for clean cord routing and keeps them out of the ceiling fan blades.
For small things that need to be trimmed out like the air supply cord reel connection (mine is a recessed box) we had to cut the end trim stuff and rivet it to the panel instead of screwing it to the ceiling since you can't tuck the edges in due to the overlap nature of the stuff. Worked out well but you have to be spot on with measurements to make it work.
Utilizing free brother-in-law labor (all 4 of them in fact), we managed to knock out about half of the ceiling in maybe 8-10 hours working, doing the worst stuff first with the most cuts in it. I need to get xome photos of the progress, but it is lookign decent. Could be a tad straighter, holes could be a smidge tighter.. but free labor is free labor and who looks at the ceiling after it's installed?
Lots of work, but I think it looks so much better. Hope to post some pictures as it gets done.