About as easy as proving your intent was to build an unregistered SBR.
And therein lies theinability of BAFTE's recent technical ruling to have any effect whatsoever.
Ask any lawyer how easy it is to prove intent.
Ok, but here's the problem. The lawyer will charge you a minimum of $250/hour just to answer your question. If you want the lawyer to do anything more than answer your question, then get the shovel out and start shoveling your money in $5,000 shovel-loads.
The bottom line: If you have to rely on a lawyer to argue "intent" as it relates to NFA laws, it doesn't matter whether you win or lose, because you are going to lose $10,000 lickety split just in the process.