I got one of these for my custom longneck Brüko. I wasn't sure if it would fit, here are the measurements I had:

Ukulele:

Length: 57,5cm ( 22.6" )

Length Body: 23,8cm ( 9.4" )

Upper bout: 13,2cm ( 5.2" )

middle: 10,6cm ( 4.2" )

Lower bout: 16,5cm ( 6.5" )

Height body: 6,5cm ( 2.6" )

Case inside dimensions:

Overall length: 22 3/4"

The body length: 9 1/2"

The Max width of the head is: 3 1/2""

The width of upper bout : 3"

The Middle bout width: 6"

The width of the lower bout: 6 3/4"

The height is: 3 1/4"

So the length was going to be tight and the upper bout couldn't fit. I figured the number for the case upper bout was wrong (by looking at the pic

). Turned out it fit perfectly: