All the ones I’ve commissioned have a radiused fretboard and a side sound port. Those were the most important when I started buying customs 6-7 years ago. I requested a few personal details (pyramid bridge only one fretboard marker at the 12th and an Art Nouveau inlay on the headstock) from Beau Hannam when he built my tenor. When I ordered he was quite busy so had to wait for about 18 months. My instrument was built in the same batch as the one he built for the Luthiers for a Cause project.Yep, $10 to $11,000 for a really nice fiddle bow.
The two things I can't get from an off the shelf ukulele, that are a must: radiused fretboard and chamfered armrest. They do improve my playing, and how long I can play. I'm onstage for an hour or more each show, so....comfort is a big issue.