How exciting! I'm on my third year of doing what we are calling a "Unified Play!" Last year we did "We Open Tomorrow Night?!" published by Theatre Folk. The one act version. Its exactly as you described. It was PERFECT for this, and a huge hit. Plus allowed tremendous flexibility to showcase the talents of our students with special needs.We had a mix of actors from both classes in the main characters and other advanced drama students direct the talent portions of the show.
I highly recommend, and feel free to reach out with any more questions about how we did this! I think there is going to be an article in dramatics or teaching theatre about it soon too!