So i was thinking about making my own replace car (replaces an in-game car) but i have no idea how to do it, and cant find a video on how to. I dont want to make car textures, i wanted to make the whole car. (for example, if i wanted to replace the blista with my own made... Peugeot 207 or something)

Are there any tutorials on how to make cars in gta5?

(edit : i also want to say i wanted to make the car that gets replaced in mods\update\x64\dlcpacks\patchday2ng)