Use Astrid under Sydney Pro as child theme for store

I have Sydney Pro as main theme on www.sincitymunitions.com. I would like to use Astrid’s store theme under Sydney Pro. Does this require making it a child theme?

You could try making a child theme and adding this code in it: http://pastebin.com/VRERFvsz
But really, this is an idea you should probably try to avoid.