The ATF has posted a faq information page on their website for what happens after 41f takes over.
Home » What We Do » Rules and Regulations » Laws on Alcohol, Tobacco, Firearms and Explosives » National Firearms Act

Or the link
https://www.atf.gov/rules-and-regula...ective-july-13

About midway down the page it has links to the Forms that appear to be savable and fill-outable.
They are in the "What Do NFA Trust or Legal Entity Applicants Affected by the Change Need to Know?" section.