How can I write a conversation between two jurors from To Kill a Mockingbird in a script form of 20 lines?

Since the jury for the Tom Robinson trial is composed of twelve white men who reside in the town of Maycomb or in the county, choosing one man from the town and Mr. Walter Cunningham may provide an interesting debate. 

With one of the townspeople, this juror should be acquainted with Bob Ewell, having probably heard about him, or even seen him in town. Mr. Cunningham can provide some counterarguments to the man from town, who like the other jurors will vote "guilty."

If you have read the play Twelve Angry Men by Reginal Rose [the script is available on the internet], you can organize your script as is done with this drama. There is also a Foreman of the jury, whose role is to ensure that the discussions are relevant and that no one bullies any other juror. Also, he ensures that any juror may be able to ask any question relevant to the trial. [http://definitions.uslegal.com/j/jury-foreman/]
So, if it is all right with your teacher, you may want to have the foreman intervene if the two men grow heated in their conversation.

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In composing the script, the Maycomb juror can express the typical attitudes that have been displayed by Mr. Gilmer and the Idle Club members outside the courthouse. That is, there is no respect given to Tom. But, while Mr. Cunningham has similar attitudes towards the black population, he is a little troubled after hearing the evidence. Also, in the back of his mind is his respect for Atticus Finch as a just and reasonable man. So, he wonders about Tom's supposed guilt after Atticus establishes through cross-examination of Bob Ewell that the blows on Mayella were made by a left-handed person because Tom has a useless left arm and hand.
At the end of their conversation, the men will disagree because Mr. Cunningham holds out for a not guilty. But, finally, he acquiesces as he is the only one who does make the prejudiced decision. However, it seems that he does this reluctantly.

Here are a few lines to get you started--

Maycomb Juror (Who sits next to Mr. Cunningham): I can see that you are thinkin' about somethin', Cunningham. What is it that is troublin' ya'll? 

Mr. Cunningham Weelll...Didn't it strike you kinda funny 'bout that there girl being hit so bad on the face, and then by a left-hander? That boy Robinson cain't do nothin' with that withered up left arm of his'n. I jist don' believe that he coulda done whipped that girl like that. It just don't seem possible.

Maycomb Juror So who did? You reckon her pa done it 'cause he seen her messin' with Robinson?

Mr. Cunningham Maybe. I hear tell he's right ornery. It don't seem right, it jist don't seem right....