Brumm has been making die-cast automobiles in that scale for several decades...it's a standard scale for die-cast car collectors (along with 1/25th), just as 1/72nd or 1/48th are for aircraft model-builders, and 1/35th is for armor builders.
No kidding. What's weird about this then is that if you were to build these models being delivered, it would have to be delivery by truck. I liked to build bombers with bombs coming out of the bomb bay (they only way to properly to hang a bomber from the ceiling, IMHO). Can't do that with these models of the two most important bombs in history. Silly.