I'd be hip to the 579 as long they offered a daycab version too. I prefer vocational oriented kits for the wide range of applications that can be done. I pounded Moebius' FB page several times for a Workstar kit as well as IH/Case tractors and implements.
Moebius mentioned in a post on their FB page that they'll have news on a trailer in a few weeks. Maybe something completely new or a variation of the Great Dane they have or.....
Gary, nice work you're doing here.
I have a bunch of photos I took of an Ottowa(2 actually, mixed) at my work if you're interested. The trucks are well used and worn, but, they might contain details to assist in your progress.
This is Daniels Photobucket page. Look in the files beginning with "Plaskit" for his products. His email is; plaskit_resin@yahoo.ca
http://s429.photobucket.com/user/danielgailloux/library/?sort=2&page=0
Someone is currently working on converting one of the CH or CL hoods to the Granite for Eric to cast. I don't have info on a time frame. It'll be here when it gets here.
Does the truck in your reference pic have a 48" sleeper? Hard to tell for sure from that angle. If so, you'll need to shorten the kit sleeper to match.