me and a friend had taken a 40 year old plane fit for the scrap heap and rebuilt the whole hudraulic system and made it fully functional within a week. we had no manuals only common sense and knowlege we had built up in our modules.

I wonder what the CAA would do if they knew you are willing to work on aircraft systems with no manuals only common sense.

Common sense tells me, as a time served licenced engineer, not to let you anywhere near an aircraft.