the reality is, it only matters if number one, you fly at the NATS where BOM is enforced
and number two if your contest awards appearance points , if you did not build it, you dont get points..
that said, there are some contests that award something like 0-10 for ARC adn 10-20 for BOM,, ( not sure, this is just what I recall)
so as I think Brett has said,, when you go to bed at night can you say in good conciense that you built the airplane? if you can say that, then you built it,,