wrote elsewhere on this group, but I think it is for
this subject:

But, what about all the external wiring required and where do you
place the
laptop?

And, what is this about an external display?

The external wiring is messy, but managable since I fly my own and do
not need to remove all wiring after each flight. I placed my laptop in
the back of passenger seat.

The point of an external display is that 1. it is very small w/o
keyboard and much easier to mount than a laptop, 2. it is sun light
readable (most laptops are not), 3. it is touch screen and FliteDeck
could be used with touch screen only, 4. it is much cheaper than a
tablet PC, cheaper than ..... (you get the idea).