Oscar, that is why the aircraft are registered as a 19... aircraft. They are owner built assembled and all that goes with that. If someone buys a 19 reg aircraft then it is buyer beware, On the other hand, if you buy a 24... reg aircraft then you are trusting that the "qualified " person working on it actually knows what they are doing and in some cases this is a little on the scary side. The average 19.. builder has a solid vested interest in doing the maintenance correctly as it is their a..se on the line, not just a weekly wage. A 19.. reg aircraft is just that..an amateur built aircraft.. and anyone buying it must realise that. Any amount of regulations is not going to make people instantly responsible. Amateur built is amateur built, professional built is different. Your term "good enough" worries the hell out of me, surely the aircraft should be built correctly and time taken to make it as good as you can, commercial interests aside. 19.. reg and 24.. reg are 2 different beasts and in my experience, most (not all) 19 reg are superior to the 24 built standards.