Multilingual WordPress Website for Luxury Automotive

I need a WP website/theme structure without texts of a multilingual website in 4 languages (french, dutch, eng, german).
I'm also a web designer (I will put the texts and images).

All pages must have manual translations already populated (no plugin-based translation system).

Page Structure (Translated for each language):
Accueil / Home / Startpagina / Startseite
À propos / About / Over ons / Über uns
Véhicules / Vehicles / Voertuigen / Fahrzeuge
Services / Services / Diensten / Dienstleistungen
Contact / Contact / Contact / Kontakt)

Style should reflect luxury, modern European automotive branding:
Hero section with a featured vehicle or dealership photo
Vehicle section with cards (image, model, price, brief spec)
Language switcher in the header (manual, per-page linking)
Footer with contact info and social links

Support custom post types for vehicles (optional)
No translation plugin dependencies (we will maintain each language page manually)
Menu must update based on active language
Deliver the theme with all pages in each language already created and linked.