I'd like to echo my fellow Troopers by saying welcome to FISD and you have most certainly found the right place to start your journey for building Stormtrooper armour.
If it's for display purposes adding to a collection I'd recommend picking one up if you can, I love mine.
On the other hand if you want for trooping think again, the MR E11 is far too heavy.
If I understand your situation, you want to display the back and chest piece with shoulder bells on a bust?
Just cut the elastic where the chest meets the abs and butt plate, then slip the top half over bust.