Short answer: No.
Beginning around 1972, Hahn customs were built in the Hahn factory. While they built Hahn customs and sold them to Beck, there was no direct connection to Ottawa. If you compare photos of Hahn and Ottawa rigs closely, they are not as similar as you might think at first glance. The outer curve of the windshield are similar, but the Hahn had separate two-piece windshields and the Ottawa shared a center seam. Where the cab face met the roof was similar in design, it was not exactly the same. Cab doors and door windows were different as well.
Beginning around 1972, Hahn customs were built in the Hahn factory. While they built Hahn customs and sold them to Beck, there was no direct connection to Ottawa. If you compare photos of Hahn and Ottawa rigs closely, they are not as similar as you might think at first glance. The outer curve of the windshield are similar, but the Hahn had separate two-piece windshields and the Ottawa shared a center seam. Where the cab face met the roof was similar in design, it was not exactly the same. Cab doors and door windows were different as well.
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