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I have already planned some other engines; mostly based on toy-train "Otto":
For example the "99 4603". I took the original engine from "Taschenbuch Deutsche Schmalspur-Dampflokomotiven" by Horst J. Obermayer. Further data and drawings can be found in: Kieper/Preuß "Schmalspur zwischen Ostsee und Erzgebirge"; Alba Verlag; chapter 2.1.1. The prototype was built in 1912 by Henschel for the Demminer Kleinbahn and in 1949 registered as 99 4603 from the DDR Reichsbahn. Service endet in 1966 on the isle of Rügen.
I also plan to build another (small) Mallet based on two "Otto" chassis: "99 5621". I took the original engine from "Taschenbuch Deutsche Schmalspur-Dampflokomotiven" by Horst J. Obermayer. Further data and drawings can be found in: Kieper/Preuß "Schmalspur zwischen Ostsee und Erzgebirge"; Alba Verlag; chapter 2.1.2. The prototype was built in 1902 by Vulcan Stettin for the Franzburger Kreisbahn and in 1949 registered as 99 5621 from the DDR Reichsbahn. Service endet in 1967.
Here pictures of a probe and the comparison of 99 5621 vs. 99 5901: