Perhaps I was unclear in my post.
Since everything coated at the current time is on 5 mil support, cutting 35mm is normal, but 120 would not be too hard to do if there were orders. Getting the paper for 120 rolls would be harder.
Cutting 4x5 and larger would be impossible as Kodak only cuts 7 mil in sheet sizes (AFAIK). There is no Kodachrome coated on 7 mil support.