Assign different core materials to different unit types

Give each unit type its own core material so wall units can differ from base units.

1. Core material can be set separately for different unit types; for example wall units can be given a different core material from base units if required.

   ✓ Comprobado en el producto el 9 de octubre de 2026

2. Finishes and handles can differ between base and wall units.

   ✓ Comprobado en el producto el 9 de octubre de 2026