It is common nowadays for people to inappropriately associate modifying a car as “building” it. In essence, modifying a car is simply changing parts around with aftermarket doodads and giving it a personal touch. Even a high-school kid with a 20 year old Japanese, 2-door compact can do it. I feel that it is more accurate to define building a car as invasively modifying a car with the requirement of hand-craftsmanship and fabrication work. Otherwise, don’t go around self-inflating yourself by specifying how your car was built, not bought (a la this sick sticker). You surely didn’t build that stainless steel fart-can or those eBay coilovers, did you?
Curmugdeonry and ranting aside, one example on how to really build a car is by fully restoring a 1965 Alfa Romeo 1600 GTA to FIA Appendix K standards. This includes aluminum panel work (the roof was straightened and fetted), a seam-welded chassis, and an amazing twin-cam with twin Weber carbs.
I’ve always admired the classical beauty and glamour of 60’s era cars. An Alfa Romeo built to this caliber is definitely on my dream list. Right along with a Jaguar E-Type (XK-E) coupe and a ’63 split window Stingray.