Wikipedia deals with Dieselpunk here. A more extensive introduction can be found here at the Dieselpunks Encyclopedia. And a few Web sites for further immersion in Dieselpunk are here, here and here.
Like most other things, Dieselpunk objects can be fascinating or ridiculous or something between. As for which, that depends on the eyes and background of the beholder. Just for fun, let's take a peek at Dieselpunk aircraft.
I don't have a name for the artist, but wish I did because it's a realistically imaginative image.
Again, I don't know the name of the designer.
This looks too nose-heavy to actually fly.
This illustration has airbrushing that looks very 1938. The airplane itself strikes me as pretty silly.
These are from the 2004 movie Sky Captain and the World of Tomorrow, which I haven't seen, but probably should have for the purposes of this post.
The Manta also seems too nose-heavy to fly.