Secondly, where does the input for the power supply connect to?. i know it connects to an AC source of the generator, but how does it connect?
With all due respect, I get the feeling you are not yet ready to be hooking things up to an airplane's electrical system.
The first step would be familiarizing yourself with that electrical system so you can answer your own question.
Since I don't know anything about avionic electrical, I can only speculate that you may need to determine if the generator is sufficiently sized to handle this additional electrical load, and if so, put the extra capacity into the battery charging circuit if it doesn't also have enough reserve capacity, then look at what the reserve capacity is on the battery itself and whether it needs upgraded, and look at a cutoff circuit if the engine were to lose power so this add-on is not drawing power away if/when it is critically needed for something else (or is that ALL powered by a separate turbine?). I'd imagine the cutoff could be something as simple as a normally open relay powered closed by the generator but again I know nothing about avionics electrical systems
and regulations which is probably where this should all start.
I doubt it's going to be "layout" per se, as much as the robustness of the design including the temperature tolerance, PCB, connectors, wires, vibration resistance, etc. though this is a non-critical system so fault tolerance seems the main issue.
