The whole thing is a gray area to begin with.
You can have as many lawyers that you want to look it over, but in the end we all know that the ATF will do what they want, when they want.
Having a lawyer look it over does not guarantee anything, It helps, but it does not guarantee .

Just like when the .22 akins accelerator was considered a bump firing device. Then some one asked the ATF to make a ruling on it. Then all the sudden, everyone that owned these once legal device, were now considered illegal. Even though it was not really a machince gun.

You are submitting these trusts to the ATF, they are looking at them, and they are approving the stamps for your trust. You got approval from the ATF for this.

The difference is, that the people who had these akins, never got an approval/Tax stamp from the ATF.