Project directory structure?

Does anyone have a general structure they follow for UE4 projects? I usually have a folder per application (3dsMax, Photoshop, Unreal, etc.), however the workflow for UE4 seems to be that you export your FBX files, flattened PSD’s as png’s (or whatever) and so on in some intermediate folder that you then import in UE4, and it maintains a link to them, so they’re not exactly throwaway files. Do you just export these files alongside the original source file? Any input would be appreciated!

I make a one separate folder for each asset and withing that folder create a new folder for models, textures, materials and the like. When I work on an asset I always work within the directory of said asset.