Just be careful with some of those rear view camera mirrors as the rougher ride in a Lotus can make a lot of them go loose and give you a bouncy screen to look at. The lighter ones usually hold up better over time but the Lotus is a harsh environment for them. I don't recommend them personally.
Take it easy on the "if they don't already know" comments. Everyone has a first time when it comes to wiring. You are also going to have to pick one or the other with a switch or auto on when you reverse unless you want your reverse lights on every time you switch the display to the camera. That would confuse some people alright, maybe get a few to stop following so close though. Easiest place to get your power for the switch is your harness for the stereo and a nice hidden place for the switch is in the cubby to the left of the steering column. You want the red wire. Get a switch that is simple on/off, you don't want one with an led for instance as that will just force you to run a ground as well. The wire on the camera harness that says reverse light connects to one side of the switch and the red wire from the stereo harness connects to the other side of the switch. You can also tap into one of the open slots for the fuse panel on the passenger side. Here is the thread on that:
http://www.lotustalk.com/forums/f157/best-place-tap-some-accessory-power-132522/
Tapping into this block would be easy but since you already have to work on the wiring for the camera you might as well just tap into the red wire there. Some cameras won't like being on all of the time and you might need to plan on replacing them every few years or so.
This is an example of what you want to use:
12V Round Black Rocker Switch 2 Pin 1 Piece Toggle on Off with Wires | eBay
This is an example of what you don't need unless you want to run a ground wire as well just to get a little light that will be always on and would annoy me for instance:
12V Round Black Rocker Switch with Green LED RRSG 2 | eBay
The great thing about these is they are cheap and easy to install into plastic like the cubby sides as you only need a hole and a notch for some that you make with a file so the switch can't rotate. They also blend in the the textured plastic well. I use them for interior light switches and trunk light switches as well. You can find them at many auto parts stores too.