I really like scenario # 3. Most of the time you'd be OK with just the
devices fused, but would you want to have an electrical fire in the
glider at altitude, with oxygen floating around in the cockpit? I have
mine fused as close to the battery as possible.

I'm a telecom manager for a class 1 railroad, and we do all our
installations with this fusing method. We have a lot of specialized
electronics in locomotives and vehicles. We don't want electrical fires
in any of those, either.

Be safe up there...

Jack Womack