You'll probably never find any serious information about that hull specifically. The only information you might get will be stuff like "we had one when I was a kid, had lots of fun" or "it pulled several skiers with no problems", all pointless info.
Kona built a decent quality hull, but what I'm trying to tell you is that it really doesn't matter what hull you start with, just check it out before you start dumping money into it. 
X2. Pretty easy to put good money after bad. While Kona is a good, solid boat, it'll never bring the slightly higher resale value of a name like, Hallett, Sanger, Nordic,Sleekcraft or Southwind.
That's not to say it's not a worthwhile project! Seems all there and if the stringers/floor, etc are good, I'd build the snot out of it!
On a 21'-23' daycruiser, kinda hard to have built in "weirdness". They were all splashed off one another, for the most part. Not gonna build up enough speed to show any real hull design flaws (Such as porposing, etc) that you would find pretty quickly in an 18' boat with high HP applied. It's a cruiser. Just make sure it's solid, safe, throw some respectable, low maintenance HP at it and have fun!
Ray
Edit: wanted to throw in there, it looks VERY much like a splash of a Hallett bottom with the roundness of the nose, etc. The step-deck looks Sleek-ish, but the upper tier more like a bubble deck. Pretty unique and done well! Given the right paint scheme could be a really sweet float!
