Gearhead, I understand exactly what you are saying.
Here is what I am suggesting and I dont know if some Munch,s came with the bumpy tanks or not.
Honda has a reputation of winning 6 cylinder road racers, so they build a 6 cyl street bike to reflect that.
H-D has a history of producing flattrack racers, so they build an XR street bike, Others build hi pipes and tanks ducktails, etc to carry on the look.
Kawasaki builds a Eddie Lawson street replica, Ducati a Mike Hailwood replica..incidently Mike Hailwood won a lot of races on the Honda 6's.
Somewhere, someone built a tank, or many tanks for a Munch(not saying it is or isnt original) that was built in the same style as most of the NSU racers . At any rate those bike s all got their engines from the NSU factory, it is a modified car engine, thus the connection to the factory. I think they came out in 68 or 69 and cost around 3700 or 3800 US back then..pricey ride.