acer aspire one cooling box (for old laptop servers)

for the past few weeks i have been using an old aspire d257 as a ts3 server and it has been working well except for the fact that it gets too warm too put in a draw. I made this so you can get airflow or an insulator layer of air. I will upload a version with a hole for a small fan, however i need to work out how to get enough airflow while keeping it small enough that its not just a box.