Leadsled,
For probably he first time I agree with Yr Right, in terms of maintenance the required schedule is dictated by the log book statement. The owner may elect to change the schedule of maintenance whenever he likes: however this change in schedule is not formalized until the logbook statement is amended. The 100 hourly is required to be signed of "IAW the logbook statement".
As for this statement:
As for "engineers", as far as the AQF (whatever it is called this week) an AME/LAME has trade qualifications, which do not meet the level to be called a profession. Likewise, holding a pilots license of CPL or above does not qualify as a "professional" qualification, notwithstanding that many pilot training courses result in a Bachelor of Aviation, or something similar.
LAME technically qualifies as a para-professional qualification, trade qualifications are for an AME (CERT IV) (hence the required diploma level qualification for LAME). Interestingly the Diploma in Aeroskills (LAME qual) involves more teaching hours (and thus knowledge) than any other diploma level qualification in Australia, and more than many Bachelor degrees.