Have made a couple of sopranino/ piccolo Ukes with 27 cm (11") scales and have been tuning them with  reentrant dgbe high tuning (an octave above a 4 string standard guitar but a uke style higher d string. In terms of playing this effectively makes them a half scale guitar with a no change required to fingering for guitar players. The half scale guitars I see like the yamaha Guitalele have a 433 mm (17") scale which is akin to a tenor or baritone Uke. Other "half size" guitars I saw on ebay had 20" scales. A standard guitar has a scale length of closer to 650mm (26").

To improve the playability of the sopranino Ukes I splurged $4 on a roll of 30lb fishing line so I am now stringing them up with a 40 60 50 30 lb mix rather than standard & tenor ukes which I had been stringing up with 50 80 60 40 lb line. The shorter line makes for a harder bend so a thinner guage makes them easier to play.

How can people call these big things half size? Is a sopranino uke really a half size guitar?