What's next:
1) The wiring is a mess. I can mostly shove it back into crevasses and pretend it's not there, but I pretty much expect to slowly update connectors and make it prettier.
2) Cover. it needs a cover. Probably just clear acrylic with some standoffs, I don't need an actual cover to surround it.
3) Fuse labels, etc. Probably printed and glued to the backside of the cover.
4) It also needs to be mounted. Right now it's just kinda tied off to the top of the front strut, I need to make some metal mounting bars to connect it to the inner frunk wall.
I bought a 12V power supply earlier this year, which proved to be invaluable. I could use it to power up small portions of the circuits one by one, instead of putting everything hot at once with a battery. It also has an amperage reading, so I could sort fuses with appropriate loads since my individual setup was different that stock (and I'm running almost 100% LED lighting).
https://www.amazon.com/gp/product/B00L2M2Y5O
As for the engine compartment...
When I installed the EFI, I rewired everything back there, I have all of the components (megasquirt, MSD, A/F sensor, etc) feed from a Painless relay block, it takes +12V always power right from the starter lead, +12V on run/start from the factory power lead (which powered fuse 22), and a relay to trigger several fuses on either always hot or triggered hot. So, it's kinda a complimentary system already to my new busbar stuff.