Adapting Interact Units to Class Size

Recently, a teacher inquired about the unit CIVIL WAR, a simulation in which students learn about Union and Confederate life in camp and on the homefront. The unit offered 36 "identities," but he taught a class of 43. The author, Terry Handy, provided a few suggestions on how to adapt this unit for a larger class. 

1. Use one character card for multiple students. If there's a problem, simply place the students with the same card in different groups - just change which contingent they're in.

2. Write one or two more character cards for each group using the same format for each card. The original cards reflect generic persons without ties to real people during the Civil War, but if they'd like, teachers can craft characters to fit particular students. 

3. Offer extra credit to the students who are willing to write their own character. Students can use another card as a template. Mr. Handy has noted that he has generated an enthusiastic student response when using this approach with other historical eras. 

Have you ever run into a similar issue? If so, what changes did you make to accommodate your class? If not, what other suggestions would you make to someone who has?