A shell was designed for it, which was produced using 3D printing. There are two printed parts (shell and bottom plate, see attachment). In addition, four 8mm long M3 countersunk head bolts are needed. The overall size is 30*80*18mm. 
Use the vertical USB expansion port to facilitate the connection of USB devices. The measured data transmission speed is around 20MB/S. 
The schematic diagram and pcb files are as follows:
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