Among the many dozens I've seen, what is a 'standard' profile?
Not sure what you mean. While Gates seems to offer the exterior dimensions in CAD drawings, I'm not convinced the drawings accurately represent the profile. But I could easily be mistaken.
Cutting one or two prototypes for an experimental project wouldn't likely be an issue. But I certainly wouldn't mass produce any or try to market any.
Dunno. That's the reason for seeking a CAD program which may have the profile included in it's library.
Therein lays the problem, Gates doesn't make the sprocket I need - specifically, the mounting is completely different, and I'd prefer 7075 aluminum. Yes, Gates offers "made to order" customs, but I'm guessing the costs would be beyond my budget. I also have access to local CNC should I need different ratios (a strong possibility).