The candles will be powered from an old telephone charger directly behind the wall, it will also power another 2 wall lights on the left hand side wall and possibly a ceiling light.
You probably can't tell all that well that the LED lights are on, but I'm sure once there is something in the window it will be perfect.
The battery holder is hidden under the window sill, held there with a small bit of wood. The switch is in the far window frame and will be hidden behind a strip of fabric. The gap above the bit of wood is wide enough to pull the battery holder out to change the battery.
With the battery holder covered up (sort of). I still need something to finish off the LED lights as they look wrong when they aren't on - they're yellow. The washers I have are about 1cm diameter and that is way too big. The LEDs are less than 2mm square. I like them as spotlights in the window though!
Happy mini-time, Idske