An LLC will not "peel away liability" from a negligent pilot or builder
Since my day job is a trial lawyer, I guess I should comment.
A corporate form of ownership (Corporation, P.C., LLC, etc.) isolates legal issues involving the aircraft to that legal entity, but only to an extent. For example, let's say you start an LLC and register your aircraft under the LLC. Your LLC, as a legal entity, owns the aircraft. If anyone sues your LLC for some reason, for example a breach of contract, and they obtain a judgment against your LLC, then they can levy (take) your aircraft and sell it to satisfy that judgment.
If, on the other hand, you take off one fine day with a happy passenger and the engine fails because you improperly constructed the fuel system. An oak tree and the resulting deceleration trauma creates two widows; yours and passenger's. Pax's widow reads the NTSB report and learns that you not only negligently constructed the fuel system, but you also failed to maintain airspeed, resulting in the meeting with the oak tree instead of the available field next door.
At this point, her trusted lawyer is going to sue your estate because you were personally negligent in construction and piloting. Although the lawyer might sue the LLC also, it would be of little use since its only asset would be what's left of your aircraft (although it might be worth it to recover the insurance payoff for any hull coverage).
The fact that the aircraft is owned by an LLC does not insulate the negligent pilot or negligent builder. Now, is the widow a bad person for suing your estate? Is her lawyer a dirty rotten shyster and carpet bagger for representing her? No, for cryin out loud. It was your negligence that made her a widow and, according to the laws we have had since our nation was created, you (or your estate) should be responsible to compensate the widow for your negligence.
So, how do we protect our widows and our estates in the event we kill or injure someone with our negligence? The same way we protect ourselves if we injure someone with our cars: with INSURANCE. A good insurance policy will compensate the victims of our negligence and defend us (or our estates) if we have to go to court. I hope this helps.