Building 5uH CISPR25 LISN seems like very simple task but evil is in the detail. Without careful evaluation of circuit and housing parasitic properties, it wont pass standard's requirement for output impedance. Furthermore, its unstable insertion losses might render it completely useless.

Hobbyists tent to stuff two channels into single box (like in CISPR-15 50uH LISN used for home appliances), which brings additional issue - channel separation aka cross-talk.

It is not really possible to evaluate the build quality without access to very expensive instruments (Spectrum analyzer with tracking generator or vector network analyzer).

To get true feeling how hard the design and build might be please read first:
https://www.eevblog.com/forum/projects/5uh-lisn-for-spectrum-analyzer-emcemi-work/
https://www.eevblog.com/forum/projects/5uh-aerospace-lisn-how-dumb-would-i-be-to-throw-one-together/
https://www.eevblog.com/forum/rf-microwave/50uh-and-250uh-inductor-design-for-lisn/

Also watch amazing video series from FesZ:

Part 1: https://youtu.be/OEvkRW5vZNA
Part 2: https://youtu.be/nq-IhHbZdD0
Part 3: https://youtu.be/M_ab0Oz2ypI

Aim of this project was to have final working product for daily usage and therefore full testing and its validation across frequencies up to 100MHz is as important as the assembly itself.

Everything is finished, I will soon upload build log with simulations, assembly pictures and validation process.