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.