(1) I am thinking of getting a Part 66 license - mostly for the purpose of servicing an aircraft of my own,
- Some "Pilot maintenance" is already allowed for Light Aircraft - however, you don't state what sort of aircraft you have or are thinking of getting. This will greatly affect your aspirations
(2) ...possibly more than that, but not as someone else's employee. The aircraft in question will be operated under AOC, and the idea is to be able to do not only routine maintenance
- If your aircraft is used under an AOC work MUST be carried out by a Part 145 MRO / Employee - That is a condition of your AOC
(3) ...but also e.g. customization of avionics.
- The design of new modifications or equipment MUST be backed up by a Part 21 Design Organisation or OEM - this is NOT a maintenance task.