Not really.<p>This is already in effect in a de facto way.  The specialty builders tend to grab cars from pre-1973(I think) since they are grandfathered in and don&#x27;t have to pass safety, emission, crash, etc.<p>I suspect that many builders <i>might</i> be able to pass some of these regulations, but the need to be &quot;grandfathered&quot; stops a lot of the possibilities.<p>It will be interesting to see if some form of &quot;standard&quot; chassis emerges that actually can pass the regulations.