Extend Stackscript with sh-script

I'm new to this whole automation thing but I managed to create a personal LAMP-stackscript based on the one provided by Linode.

This script starts with #!/usr/bin/env python and then installs the basic LAMP. In the past I used an config.sh to set params like timezone, hostname, add a user etc…

Is it possible to feed that sh-content in the stackscript? Or does it need conversion to the python syntax?