Someone on Flea Market posted the string spacing measurements for the Hawaiian Ks versus a Kala. The Kala was much narrower. Dominator has posted that he does not like the Kala spacing because it make picking harder. I have never played a Kala so I have no opinion.
3/8" at nut and a 1/2" at saddle is a good starting point. I use metric 10mm at nut and 13 - 14mm at bridge depending on the instrument although I have just done a wide nut for Heiko Bron...