After typing with V1 proto for a month, overall I am happy with the look and typing feel, the typing experience is firm but not stiff, and the 50A silicon pins allow some bounciness in the board. Personally, I always build my keyboards with plate foam, it reduces those tiny noises and still keeps the characteristics of the board. The sound is quite clean without case foam, more on the clacky side. I bearly noticed any hollowness, but it is a bit loud for my liking.
For the V2 proto, the goal is to keep the sound profile more isolated. I added more screws between the two cases and lengthen the rubber feet, hopefully, it can reduce resonance between the metal pieces, and the thickness of the top case has been increased by 1mm to make the sound more isolated.
Red arrows indicate the newly added screw holes, the placement won't affect how the space bar sound.Show Image
One thing I am currently testing is the patina on the brass bottom, I have included the photo in the IC form, please feel free to check it out and leave some feedback. If you are a patina artist who enjoys my design, please please reach out to me.