You should definitely contact an attorney. To the extent that the neighbor is impacting on your property or your rights, you may have a cause of action. Note however that you probably can't enforce requirements that do not actually affect you. For example:1) Porta-potty smells, hazardous fuel containers, excessive noise at inappropriate times--these are all things that you may be able to take actino on.2) Altering a barn without a permit--you don't have any standing to bring a legal action to enforce zoning or building codes that don't affect you. Whether they had a permit or not is not really your issue, unless you can show that it does affect your property or violate your rights.So you should have some causes of action you can bring, but not necessarily all the ones you name.Also, if local officials won't help, try county or state officials; for example, the state department of environmental protection may be interested in the fuel containers.