My problem with these non-professionally prepared trusts is that too many people using them may screw the rest of us eventually.
ATF has considered adding the CLEO signoff requirement to trusts and corporations. If more people abuse this part of the law (by drawing up trusts that are inadequate, or by forming corporations that have no legitimate purpose and adding their friends so that their friends can posess and use their NFA items) the ATF is MORE likely to add the CLEO signoff or do other things that are detrimental to the rest of us.
So for those of you forming a trust or corporation PLEASE consult a professional who is FAMILIAR with the NFA. One place to start is Mark Barnes, he is an attorney in DC who knows more about the NFA than anyone I know and who interacts with the ATF NFA branch regularly.