The benefit of the Trust in the past was that you didn't need to get the Crown's, aka LEO, permission to submit your paperwork to the NFA. When I was living in Michigan, the Kalamazoo police chief was a total dickbag who didn't believe any non-LEO should have a suppressor or SBR/SBB. So if you were doing an individual Form 1 or 4 you had to go to the assistant DA's office and get him to sign off on it. With a Trust, you skipped all that nonesense. Plus, the Trust eForm 4's were getting approved in less than 90 days, while mail in Form 4's and individuals were taking 9+ months. My first can took 63 days.
The passing of 41f screwed all that up. Now, you have to get everyone on trust that is a trustee has to get fingerprinted as well. But, now you just have to 'notify' your LEO of your submission, you don't have to get their permission. YNOTAZ is correct that every time you add another NFA item to your trust you can remove the trustees then add them back in after the items is officially added in, but something about doing that seems grey.
The passing of 41f screwed all that up. Now, you have to get everyone on trust that is a trustee has to get fingerprinted as well. But, now you just have to 'notify' your LEO of your submission, you don't have to get their permission. YNOTAZ is correct that every time you add another NFA item to your trust you can remove the trustees then add them back in after the items is officially added in, but something about doing that seems grey.