the switch box most likely has a nice long cord on it to allow it to be moved from that location. Usually they are long enough you can operate it from outside the vehicle.
Bags are fun and the ride quality will be close to stock as long as it is not all the way up or all the way down. However, you will likely be working on it constantly. Fixing air leaks, blown lines, popped bags, ect...
I installed a setup on my old altima I had and it was great. Just a ton of residual work.