In the last post I mentioned that it's fairly easy to modify the basics and create variations once you have the core shape down. 
 [http://www.gamasutra.com/blogs/ChrisHildenbrand/20120917/177819/2D_Game_Art_for_Programmers__Apachestyle_helicopter.php ] 

So as requested by some here is a modification tutorial bringing the Apache more in line with the helicopter used in the HeliAttack3 screengrab at the top of the last post. 

Instead of the usual start with a simple shape I take the helicopter from the last tutorial.

Note:
You can download it for free at the bottom of the previous post.
[http://2dgameartforprogrammers.blogspot.com.au/2012/09/apache-helicopter.html] 

Note:
Keep the guns and missiles separated when exporting your art. Add them as separate objects attached the the base shape in your game engine to allow flexible use (e.g. firing and rotation for aiming).  

I hope this shed some light on how quickly you can reuse and modify vector elements and create new assets for you game or illustration needs from existing images.