I want to get their pivots centered at their respective local origins.
One solution I could think of was that I could bring the pieces in the scenes, and then change their pivots to be at the local center. But, to do this, i need to be able to change the pivots using C++ that could change the pivots of all the pieces. Can I do that? If yes, I would dance a bit. 
The other problem that I am having is that if I rotate an object along yz axis, and click enter, unreal automatically changes it to a xy rotation.
Rotation Input: X=0, Y=90, Z=20, Unreal changes it to X= -20, Y=90, and Z=0