Project Box for 50x70PCB and 18650

I'm just getting into learning about hobby electronics and this seems like it will work well for some ESP8266 projects I'm playing around with. There are SO many project boxes on Thingiverse that something very similar may already exist. Since there are so many it makes finding one with the dimensions you need pretty difficult so I designed this one. It's setup to hold a 50 cm x 70 cm prototyping board or PCB along with a mount for an 18650 LiPo battery. 50 cm x 70 cm is probably bigger than