This is a case for the DPS3005 or similar power supply modules. It will fit a DPS module, binding posts, a switch as well as a 200W step up module and Li-Po/Li-Ion battery.
I used it to build a battery powered, mobile power supply for up to 24V of output. You can find some instructions on Instructables and a german video series on YouTube  .
Please note: This is a somewhat old design and has a few flaws. The lid was supposed to slide on, the front left corner however has no clamps and tends to get loose. Also some of the holes might need to be enlarged after the print.