Surely if you build a system yourself, as an assembler, you can sell it to your wife, for instance, for a nominal sum, say 1€, and then you have sold it to a third party.
Thus complying with the terms of the OEM licence.
Erm no.....
Look into how one becomes a System Builder..... you have to be a Microsoft Reseller and then activate the System Builder part of the reseller programme.
You can't just go call yourself a System Builder on a whim just because it suits your desires to bypass the licensing.
Go buy a retail FPP copy like you should.