The first 40 (D1 - D40) had straight wing tips. This version can be built out of the Amodel box. This version was superseded by the Do 24 in 1938/39.
The last six (D41 - D46) were different in more than one aspect. They had a keel as opposed to the flat bottom of the Amodel. They had rounded wingtips, and the wing had a span of 27.20 m against 23.20 m of the first model.
So Amodel should have made a very different model. For the later model, the defunkt Huma model was a good basis.
I am very anxious for the new Amodel.
By the way, the boxart is historicaly inaccurate. When they countered the Japanese, the planes were camouflaged in a dark grey - bluegrey colour with a small number under the tailplane (like the Do 24's) and of course with the orange triangle instead of the red-white-blue roundel .
D43 was shot down by Japanese on March 2nd 1942 near Surabaja - Java.
Cheers
Hans