Just thought I'd share this with you.
My new build is going to be relatively compact and not in the slightest bit realistic to a Boeing in any way. But all I want is functionality. So what I've done is I've made a header board to have 4 arduinos nice and centralised with screw terminal blocks for easier connections. With this design the only thing that is actually soldered to the board is the male to male header pins and the screw terminal blocks. I did this so that you can easily remove and replace the arduino board should I need to.