Thank you for the comments! The reference for me is the Hypex NC400_datasheet, page 13, Figure 2, preferred connection scheme.
- So, I agree on the "house" ground. However, there is no"star" point listed at SMPS600
- On/off switch is not really needed in my opinion as I leave the amps always on, and many owners do.
- About Shrink tubing... the opinions on that differ. Kondo amps for example have none.
- Agreed on the signal and power lines. I guess the best would be to shorten the signal wire to route it the best possible way.
- The soldering points are good. I doubt you can judge from the images anyway.