I met a fella at w+p a few years back who had a willys, he had a peugeot diesel fitted and people were queing up to buy it!
Your motor mark, yours to do what you want with it.
Just don't paint it pink!!
TBH, if you have a ww2 vehcile and wear a ww2 uniform, I can't see people thinking that your monty!!
Just make sure what you wear is correct, however, 'correct' is a bag of worms..........