I just don't see how this practice is acceptable!
As I read the original question it was for someone to build the aircraft, not about a builder assist program.
What follows is my view, given the rules we have to follow in the UK. There is a 51% rule and IIRC also the inspector has to be satisfied that the aircraft has been built for the use of the builder(s).
Imagine the scenario: A brand new, freshly painted, unflown RV8 emerges from a container and assembled at an airfield "somewhere in southern England". Before it can fly it will need a permit to test and will need to complete the 5 hours (or longer, as required) test programme etc etc as per the (British) LAA. In order to get a permit to test an inspector has to inspect and sign off.
But even before that the build has to be registered and a build book issued, then the various inspections have to be completed; workshop, empennage before being closed up, etc etc. Is it likely that an inspector, when presented with the new aircraft, will agree to sign all the inspections not having been able to do ANY of them except the last one? I've dealt with two inspectors over the last 3-4 years and I would be stunned if either of them did anything except say (a) NO WAY and (b) inform the LAA about the existence of an aircraft built in obvious dereliction of the rules.
It's not pushing at the 51% rule, it's ignoring it completely - it's no way like getting your panel cut or getting some welding done or all the other minor things that we all need some help with. Result - an expensive and large pile of scrap.
I agree with Andy that we shouldn't be condoning the suggested practice and personally I question the notion that one can have time to fly but not enough time over say 2-3 years to build.
Don't want to offend site rules so enuff sed I think!!
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Chris