Just something I threw together on Tinkercad in an hour or two while watching TV. There's a grid that's meant to sit in the bottom. you'll have to slightly stretch the grid to: 62.5mm by 64mm (2 of them), 49mm by 70mm, and 49mm to 52mm. while keeping them all 8mm tall. Sorry about the poor quality pictures, I had to screenshot from my phone. I recommend using supports for the overhanging section.