If I could make a suggestion as to a research route Delphine - let's say you've been given a problem to solve - how about a new baggage locker, on a middle range EASA aeroplane. Something like an Islander, which is the top end of CS.23 (or if you're happier with CS.25, a Falcon 50). Use that as a route to find the regs.
I think that you'll find the regs applicable to the baggage locker fairly easily in CS.23/CS.25; you should find advisory material in AMCs, and you can usually use some FAA ACs to help you which EASA will accept.
Then work out how EASA wants the application constructed, how you make it, to whom... At that point I think that you're likely to find the problems I'm referring to.
G
[CEng FRAeS]