This is my take on the Lithophane lamp/Gift box. It has been designed to take flat 100 x 100mm Lithophane panels all round. I have also included a solid top panel.
I used http://3dp.rocks/lithophane/ to create 3mm thick Lithophanes. Under settings, Image settings I added a 3mm border.
The light is a 220vac 4w LED Bulb (Pick your own correct voltage) & a bulb fitting that screws into the bottom. https://www.banggood.com/Non-Dimmable-E27-4W-10-SMD-5730-LED-Pure-White-Warm-White-Light-Lamp-Bulb-AC85-265V-p-1138354.html?rmmds=search&stayold=1&ID=3837&cur_warehouse=CN
The mounting holes is 5mm deep, just add the thickness of your lamp holder to calculate the length of M3 self tapper needed. Similar to this: https://hydroponic.co.za/hydroponics/e27-lamp-holder/?gclid=Cj0KCQjwxN_XBRCFARIsAIufy1YptC5M1RjLr7rU-P5_vHvyS06yx8kTufbkQo3G-_3V8JLmCSaEfNIaAviPEALw_wcB
The base includes a cable lock to keep the cable from pulling out. Use 2 M3 x 16mm to secure the cable lock.
The cable is 6mm OD. The switch is a 2 pole switch with a cutout dimension of 13 x 19mm. https://www.banggood.com/1Pcs-2Pin-Snap-in-On-Off-Rocker-Switch-Control-Black-p-920431.html?rmmds=search&cur_warehouse=CN
The box is held together wih 8 M3 x 20 self tapping screws.