OP's Puzzle#1587 - Nackardbaker

[Otto Puzzell]

Know what it is?

Please, respond below and share your knowledge of what this is, and what is was.
As always, detailed answers are greatly appreciated by all. 
If you haven't registered yet, you need to do so in order to reply with your answer.  You can do so by clicking here.

Also, please be sure to check out our other puzzles, and, please post a puzzle of your own if you'd like - the more, the merrier.

Thanks!

[Otto Puzzell]

An Expert will know.

[Otto Puzzell]

I was wrong again...

[João]

1957 one-off called "Nackardbaker" custom roadster built by someone named McMahon in Southern California.

[Otto Puzzell]

Correct so far, but you have not answered the question posed.

Locked for you for 24 hours.

[João]

Correct so far, but you have not answered the question posed.

Locked for you for 24 hours.

The chassis from this car come from an Fiat-Topolino, made from 1938-54.

[Otto Puzzell]

That's one of the sources, and an very important one. The engine is believed to have been a Crosley unit. The major body parts came from a Nash, Packard and Studebaker, which gives some insight to the origin of the car's name.