This entry covers several little sessions of figuring out where to put everything, getting the correct hardware, and mounting everything to the firewall!
Initially it seemed to me there'd be plenty of room for everything, but it actually filled up pretty quickly. I had to be careful to lay things out in an efficient way for wiring, and I also had to watch out for things on the forward and aft side interfering with each other (I couldn't put a bolt for something on the aft side through a space where I had already mounted something on the front side).
Here's a list of everything on the firewall.
On the forward side (roughly from aircraft left to right):
Throttle Cable
Mixture Cable
Firewall Penetration (for wires)
Start Button Relay
Battery
Filter Capacitor
Alternator Control Relay
Voltage Regulator
Ammeter Shunt
Master Contactor
2x Ignition Coils
Fuel Bulkhead Fitting
Turbo Cooler Water Pump
Oil Filter
On the aft side:
Cables & Wire Penetration
Fuel Level Probe Transducer Box
Garmin GEA 24 (engine/sensor interface)
Ground Block
TCW IPS-12-4a (power stabilizer)
3x Fuse Blocks
It was fairly tedious to mount all this stuff, mostly because I had to go hunt down all the hardware and wait for it to show up, and also because I couldn't access the front of the firewall to drill holes in a lot of the locations, so I had to drill them from the outside. Despite that though, I don't regret figuring this all out after the engine is installed, because it made it easy to avoid large engine parts that would have potentially interfered with other parts (like the turbo and exhaust).
It's hard to show everything in photos, but here are a few:
Here are some poorly drawn sketches that might also be handy for reference:
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