sir i feel so much problem when i navigate, please add walk mode and fly mode,walk mode work with key to walk on scene and jump with space key look around by mouse like we walk on video game this will help to explore the project. it need so much sir, i hope you are listening me.
Use the tool that looks like a pair of feet.
I think this tool could be better 
maybe walk and look around could be connected in to one tool to be more similar as fps games. 