Airplane restoration is a completely different ballgame. Where we measure our car projects in terms of man hours by the hundreds, with an aircraft project, it's well into the thousands, and multiply that by double if it is to be an airworthy restoration. The TBM Avenger I had a chance to work on took an estimated 20,000 man hours to restore to airworthy, and the Avenger is a single engine plane. I can't imagine the complexity of restoring a four engined bird.