You got me there. I was so focused on the engine that I didn’t pay attention to the text at all!!!
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After checking my references, I have the crazy idea of building a Wannentender from scratch. The Drehgestell Flachwagen kits from T-Model give a good base for the bogies. But I have to check out the original engine at Deutsches Dampflokomotiv Museum.
Something must have bitten you 
Yes, sometimes I have some crazy ideas. 
The trucks are the hardest part. If you have those you’re already off to a great start. Plus, to my eyes it looks welded rather than riveted. That should save several days worth of work. 