Does anyone with experience of the Polaroid 110b conversion by Four Designs know if they also modified the viewfinder to show the correct field of view when they carried out their mods?

I'm assuming that the modern packfilm has a smaller dimension than the original film intended for the (unmodified) camera, making the frame lines inaccurate?

Any comments on the relative accuracy of framing (or any other tips for using this particular conversion) much appreciated!