MIMF

Those tall frets look oriental/far east.

So here is the result of a more thorough measurement: Scale length 48.7 cm + 9 mm for E, 8 mm A, 6 mm D and 5 mm G (give or take a mm, as the rounded saddle makes it a bit difficult to see precisely where these fat strings touch).

A quick job with a ruler says: going gradually from about 8 mm compensation for the E string to about 4 mm for the G string. If you stray to the forum at ukuleleunderground, you can search for a couple of threads about u-bass conversions (including my humble efforts). I'll give you a more thorough a...

The Pahoehoe strings are rather low-tension, so you don't need to beef up anything. It will be worthwile to strive for a decent non-amplified sound, I converted an existing baritone 'uke into a bass, and it is certainly loud enough for practicing.