You are right on the stripes, I have seen some variants, although the most common stripes I have come across are like mine and Klauses car, except the rear sides sometimes start before the rear spoiler and not under it.
The one thing we realised through the restorations is how many variances we got on some items. Since the cars were mostly hand built some items were only made for these cars. Somewhere along the line they ran out of an item and replced them with a standard production item and then returned to the original item when stocks arrived!!. All the holes in the body were hand drilled, as none of the paterns match from one car to another, except for the bonnet which is pressed.
The black side spats have skrews moulded into them for attaching them into the body. The skrew heads have pieces of wire hand soldered across them to help hold them in the mould. Gearknobs also differ, from wood with the dogleg pattern (Klauses), to a wooden one with BMW badge, which I have, and even the black rubber with the inlay dogleg badge which is in my car currently. Dashboards also differ, I have a dash with a speaker section above the passenger side tray, others dont.
Its whats makes them unique..no 2 alike it seems.
PS.. Love the bike in the pic.