Diesel engine - ECU’s and electronics.
Have you looked at potential maintenance locations and if they’re qualified to work on your airplane/engine?
Of the wall question - will you be wearing pilot shirts and epaulettes?
Couple of years ago I watched a documentary on a Private Pilot flying a DA40 from Spain or Portugal to Asia.
Had to wear a shirt and epaulettes transitioning certain countries where light GA is non existent and if you’re not wearing the “uniform” you’re not a pilot and may be denied access to your plane and all sorts of other problems including being considered a spy.