My new work space is set up and I'm back to building. My necks are drilled with US-spec machine holes but I tend to prefer the Hipshot import machines because they are offered in shiny chrome vs. shiny nickel for the USA models. To address the slight difference in spec, I use a #7 O-ring on the ferrule to center the import bushing and these work well on both 3/8" and 1/2" machines.
I'm transitioning to roasted maple with chrome logos, glossy faces, and Hipshot string retainers as the standard offering on my conversion necks. I'll still build a few here and there with black logos, satin headstock face, and vintage string trees for those who prefer a more traditional look. These tend to sell before they're even advertised, so I'm currently working to accumulate inventory. I'm down to two again, and I think one may already be spoken for.