There is always space for improvement!

For the very first time of using podcast in an English classroom. I have designed a 40mins class for a group of EFL students who are sixth grade. First of all, I revised the orignal version of " Three Little Pigs", recorded part of the story and upload the file on Podomatic. And students need to listen to the story, work in groups and come up with a creative ending for the story. Finally, they gotta record their own ending for story and upload the file to share with other groups. Students are informed that their story will be scored by on the creativity of the ending, fluency of speech, and accuracy of grammar. I want to make learing as fun as possible while at the same time achieving teaching objective. But I think there is always space for improvement, and I 'd love to have any suggestion to revise the task. Thanks so much!