Good points...I'm using a Paughco frame which "should" be close/right, and has the stock style axle plates, but putting the rear wheel together from parts, after market axle kit, etc., I expect some work getting it lined up right. Right now I've got the brake backing plate, and drum/sprocket lined up, and sprockets lined up, but there does seem to be an issue with the right side spacer...but again, I expect some of that. Otherwise, looks like the brake side of the hub, brake drum, backing plate all line up when I mock it up in the frame with just the hub, backing plate, drum, and axle and assorted axle parts, and throwing some washers in on the deal between the right side spacer and frame.
The axle from the kit is the right length, perfect fit for the frame, so I believe my frame is also of the correct width, but that the right side spacer is a bit short for some reason.
I just laced a new J&P Star hub up to my wheel, (last night) but it hasn't been trued yet, I'll take your advice and mock it up an see what/how much offset I want, just in case the stock offset isn't right for it.
By the way, what do you mean that the pattern changes between the late HD rim and the KH?