The first question to ask is if the aircraft is on an airworthiness certificate or permit?
Certificate aircraft can have their 50 hour checks done by the owner – we always did this with the PA22 and it saved two or three hundred quid every six months. There is no question of a hangar inspection – do it in a field if you wish.
Permit aircraft can be fully owner maintained, but will require the annual to be signed off by a PFA engineer / inspector
Moggy