I do frequently get asked if I built it. This week a car full of 18-20 year olds pulled up at a stop. One asked, "Excuse me sir, where did you get a car like that?" I was about to make up a BS answer, but the young kid asked so politiely that I respectfully gave him the truth. I don't get "excuse me sir" much anymore.
My favorite was another slightly older kid passing in the opposite direction slowly. "Is that a Morgan Three Wheeler?"
"Yes it is!"
"That's f#%@-ing awesome!"