When things get urgent: Frame profiles and panels
If things have to be done quickly - or the structural situation does not allow for a standard solution, practical and functional solutions can be quickly produced with door frame profiles made of oak or fir.
The advantage of the individual door frame profiles is that they can be selected and produced from several dimensions.
For special dimensions, excess widths, applications in natural wood, etc., the "strong" panels can be made of oak (e.g. for fire protection elements) or in spruce/fir (for door linings, etc.)