Have B-25's and B-26's been converted for private business use? In the movie Cash McCall, the main character, McCall, owns an aircraft that looks remarkably similar to a B-25 or B-26, but is painted yellow and has no turrets.

Have these aircraft been converted for private business use or were there business aircraft based on the design of WWII bombers?
IMDB:


  McCall's plane is a demilitarized Douglas A-26 Invader, a type used in WWII. 


Since the film was made in 1960, I imagine there were plenty of them around.

(The A-26 was known a the B-26 from 1948 to 1965, according to Wikipedia. The B-25 is easily distinguished because it has the twin tail.)