Yeah, the "45 total inches" rule is primarily unenforced. Like you said, as long as it fits in the overhead, I've never seen anybody have a problem. I'm betting it'd fit, but don't quote me.
Anyway, I wanna applaud Mike for the videos b/c I see a lot of amateurs try to explain some aspect of their profession on camera and it goes so, so poorly. Mike, you have a skill here.