Thank you for the quick responses. All of this was quite helpful enlightening.
I'm not sure of using regular 16 film because of how hard it is to find where I am (rural Ontario). Though if anyone has any ideas on where I can get colour double perf film (some online store, surely) it would be much appreciated. I had initially gotten the Kodak as a display model really, so I'm not too hurt about that either way.
With what research I did on the K-3 beforehand, you'd figure I would've known it shoots S16. Information about film & film cameras seems too difficult to find, even with a good search engine, nowadays.
I've seen some stuff on the subject of the off center viewfinder when using an S16 gate from which I gathered that it wouldn't be all too difficult to work with, but I feel that it could hinder the framing, possibly take away from what's going on in the far right end of the picture.
Again, thank you all. You have no idea how much I appreciate this. And as I said earlier: any and all advice is welcome.