Im no lawyer. You should consult a lawyer that does trust work in your state as all states have different trust laws. But im pretty sure any changes you make have to be notarized.
Photocopies are good enough for the batfe.
5320.20 is for temporary travel notification to the atf. I dont know the form you need for a permanent move. But i do know you need to notify the atf of any permanent move of all nfa items including suppressors.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent