I have my iTunes library and one of my iPhoto libraries on my external drive which I plug in to my laptop at work. I don't need them with me at all times. With the new usb C you should be able to plug that straight into your ex HD and it should supply the power for the laptop. Another cable should be able to go from the HD to the monitor. Or a hub can be used. Its all doable, or will be over time, me thinks.