Quick note here.
On the FDS-SYS4X card you were concerned about the proximity of the input and output connectors... I think you misunderstand our design intentions.
Many of our customers use multiple SYS boards. The in/out approach allows you to power more cards down the line by simply connecting the output of the first card to the second. No reason to fear anything as it is simply a "loop"....
This has allowed us to substantially lower the number of power adapters on our large trainers.
Just wanted to interject as this is a very handy feature, not a detriment in any way.
Nice work on your build btw, reminds me of when Steve and I started our first project before FDS took all of our time.