Hi Pabs bit of a sand and will be ok. For electronics at this stage will be using the cut out holes for the coloured insert and also currently looking at the slim (sideways battery) battery box that would fit in the end of the guitar. As the back will be black still may put in a small black cavity cover which may neagte the need for battery box. winging it at the moment. Will make the call once the fretlight kits turn up and how cumbersome the pieces are. with the 3mm acrylic will it light up well with a small lightsource or is it fairly opaque.