Funnel isn't needed either.

Not difficult really. Despite your description, it's too big and doesn't allow the player to see what really does what easily without traveling everywhere. You can get trapped with the light bridge unless you portal bump out (or noclip). I didn't need the sphere or anything. Just the laser redirection cube and then portaled over to exit side above turrets. Dropped down from there and exited. You should probably put up your intended solution because I see many ways to do things differently. Many flip panel surfaces were not used and the timing portion is pretty pointless.

Just some thoughts.