Thanks TedC. It was bought locally at a consignment store, so should be in its native market as Kona was still Canadian at the time. The cranks are actually XT by the way, the writing isn't visible in this pic.
Before asking on here I did some quick internet searching, and from what I can tell it's not a '97 frame as it doesn't have the top pull canti mount, and it's not a '99 as it has the split seat tube. However the '98 seems to have only come in orange, and the '99 seems to have only come in this exact colour with these exact decals. Also the drilling and colour of the link doesn't seem to match perfectly with any year.
As for the fork, the knobs are round and red, the dropouts are long and sleek, the arch is very sparingly drilled and it has matching disc tabs on both legs, all '97 qualities, but the two remaining decals are the blue '98 style.
On a different note, I still have most of the parts, wouldn't this make a great Spooky Metalhead build
'98? Kona King Kikapu (sold), '98 GT LTS 1000-DS (sold), '00 Rocky Mountain RM6 (broken, revived with '03 RM7 swingarm), '98 Yeti Lawwill DH-6, '02? BeOne Extreme Dual/Trial?, and many modern bikes