How it's made
Every livery is painted onto the same 3D model of the Topolino. Colours were sampled from press and street photos, and stripes, badges and lettering were measured against the real car.
Sources
Fiat and Stellantis press material as reported by Motor1, Top Gear, Auto Express, HDmotori, Motorbox, Automoto and others. An independent fan project, not affiliated with Fiat or Stellantis.