OK, thanks for the info. The Holga PC hasn't arrived here yet so when it does I'll just shoot it and figure out the framing. I had assumed they probably used the same viewfinder piece as the 120N so it's probably not representative of the wider pinhole view. Time for some experimentation!
Speaking of experimentation, I shot recently 2 rolls of 35mm film in one of my 120N's. I've shot 35mm film many times in my RB67's so I thought it would be interesting to do so with the Holga. I bought the kit on Amazon that includes the back with no window and decals for the winder nob that shows how much you need to turn to advance the film to the next frame. Sadly, that decal was WAAAAAAY OFF and I had overlap on every frame. I was not happy about that. My bad for not verifying or testing it with the back open and a dead 35mm roll. While others might like the quaintness of overlapped images, that wasn't what I was going for. The nob decal started out at basically 24 clicks per frame, then reduced that after the 3rd frame until the end of the roll. Realistically it should start at around 36 clicks per frame, and I may just keep it there even though I may waste some film with larger gaps near the end at least I'll have a consistent manner to wind it that I won't have to think much about.
Jeremy