If you want to make it 'one step' then I see two options :
 
1) you can add a command to your python script to run the make_01_webapps command
    this is a good short-term solution
2) remove the python script altogether since it doesn't really add much - only installs the android tools and build just one app (the other two are covered by make_01_webapps).
   this is a good long-term solution - to do this we need to add the functionality to install the android tools to 
   make_01_webapps, and functionality to build HexGL (I've not looked at that yet).