VE 08 Omega ute door speaker mod??

[stormtrooper_17]

hey i know this might sound stupid but i was wondering if you're able to add a secondary set of door speakers on the stock interior of a 08 VE omega Ute?? like double door speakers' do you have to customise the door to do so or can you cut a hole and add them?? pretty curious about this haha
feedback would be awesome ^_^