Incorporation is, by no means, technical.
Jon Postel is on the ARIN Board. Most of the focus will be on the management of the IN-ADDR.ARPA zone. When Don Heath testified before the U.S. Congress, he described the IETF in similar terms. I am not certain if he described the IANA as a division or not. It might save a lot of time and money to follow either the ISOC or ARIN suggestions.