For #3 we just used Mote for the simplest possible setup, but there are a bunch of ways you can go about this at a whole range of costs depending on what kind of lighting fidelity and control you want.
For #2 there’s a thread on these forums about sourcing and installing 12" displays: 12.1 Inch Display Question
And some useful discussion around powering some of the alternate screens and the Pi in a tidy way: 12.1" Screen / Pi power