Thanks for the advice :) I "exploded" the mesh and made sure the cage wasn't intersecting any meshes to be sure and i will probably use this is in the future as well :)
and here a PDF with more info... https://cdn2.unrealengine.com/Unreal+Engine/Why-Real-Time-Technology-is-the-Future-of-Film-and-Television-Production-ecc14547ab8a340d4c00e2f931adfcf3a201478d.pdf