You know, I have a question kind of related to this.
We all know the 54 Godzilla had 4 toes, as seen here. This is the first suit made that was too stiff, so they sawed it in half and used the bottom part for close-ups.
But in a lot of the funny behind the scenes and promo shots you can find out there, the second main suit clearly has 3.
So was this a later alteration after shooting or did the two suits have different feet? I know the 55 suit had 4 toes before 3 took over for the remainder of the original series. I wonder if 3 made it any easier to walk in the suit.