@Leadsled - I thought the FAA Form 337 was pretty much the equivalent of a CASA Form 442?
Recently I had another EO done for a fuel level indicator and, apart from needing an electrical load analysis, it seemed much easier that earlier EOs.
Bob MacGillivray down at West Sale did the EO. Great job and he was very fast in knocking it over. Seemed ten times easier than earlier EOs, so I assume the regs have changed in the past few years.