Based on the absence of provided plot details or character information for 'Lower Saxony under Construction', it is not possible to assess the presence or portrayal of LGBTQ+ characters or themes. Consequently, the film is categorized as N/A for LGBTQ+ depiction.

No information regarding the film's plot or characters was provided, therefore an evaluation of its portrayal of transsexual characters and themes cannot be conducted. The net impact is determined to be N/A due to the absence of data.

The movie does not contain any action or adventure elements.

As a 1951 documentary, "Lower Saxony under Construction" primarily depicts real-world events and people without adapting fictional characters or intentionally altering the gender of established historical figures. Therefore, it does not contain instances of gender swaps.

As a 1951 German documentary about regional construction, the film primarily depicts real people from that historical context. The concept of a 'race swap,' which involves altering the established race of a character or historical figure, does not apply to this type of factual portrayal.