Voyager Compression Rifle with lights and sound

I bought this rifle from MR. It was important to me, to have a fully functional rifle. But I never found images for settings or fire buttons. So I build the fire button in the side of the black handle.
No status bar but flashlight

The batteries gets a special place. The cells on the side (light gray).
I inserted magnets in this cells and in the body of the rifle. The problem was, the cell would be not fit in. So I screw metal rods in the cell and fit a hole in the body. So it cant get out of place.

André