FYI, I've decided to stay with a current chassis.
And the build is complete and works great!
I am getting used to the sound as it very different from Crack. Definitely more resolution, but less volume on my DT880. I have to crank it up to 90% on those. Now I know why people say those are hard to power 🤣 Crack is probably good with voltage.
I will make a separate post with photos and impressions once I give it a good listen. Thanks everyone!
Crack, Mainline, Pipettes, Subette