I have only been thinking it through for a couple of days but I am planning to write a Godfather Part IV in either novel or screenplay form (suggestions welcome).

The plot will present three parallel storylines. The first will centre on Sonny Corleone's rise in the mob around the time of Vito Corleone's glory days. The second will follow Michael after the events of the Godfather Part II (Winegardner's books never happened). The third will expand on the Corleone saga after Part III as Vincent aims to establish the Corleone name as one to respect once more.

Thoughts? Am I biting off more than I can chew? Screenplay or novel format?