I understand that you see this in a way that might hurt some people's feelings. I understand that there are some who may feel upset at seeing a flag from an "enemy" country on our soil being displayed as a point of pride.
As a soldier, I bear no malice towards the enemy soldier. No hate or love. He is merely doing his duty same as I am. If we meet on a field of battle, our lives are of no consequence to the meaning or reason for war. We are responding to the call for duty from our leaders, in their job of guiding our country and making these types of decisions. We are but meat in the machine.
Therefore, I have no ill will towards the Japanese people or their symbols of a bygone era. The symbolism of the "Rising Sun" is an honourable tribute to the birth and creation of a nation with hopes and dreams of creating a better place for their people. What I draw from this, is that I have created a "rebirth" of my car in tribute to the original nation that invented this incredible machine. And in that rebirth, my hopes and dreams of where this car will take me (physically and spiritually) are represented for the world to see every time it sits at a car show for others to admire (and criticize!).
I hope that no one is offended in the way that you describe, but I am pretty sure I will not be displaying my car at car shows hosted by WWII veterans of the Pacific. If so, I will gladly close my hood and offer my apologies along with an offer to buy them a beer (or two).