Autodesk and FRC 2016

[thinker&planner]

Always glad to see Autodesk's continual support.

We are thinking about switching to Fusion360 this year for FRC for a few reasons, but have a few issues with it. We want to switch because of the cloud-sharing, integrated CAM (love the waterjet CAM feature), and the direct insert from McMaster button.
My biggest concern right now is that I don't understand how to structure what are "assemblies" in Inventor. I understand that there are bodies, components, and component groups, but should I be making a new file for every part, or just every sub-assembly? It seems like Fusion is geared more towards the one-file robot, with all parts in that file. My only problem with this is that I made a, assembly (component group) and tried to export one of the pieces to make CAM for it, but it did not export correctly, and there was some messed up associations.

I would also love to have a belt/chain (pulley/sprocket) generator. Oh, and sheet metal parts.
Thanks