Both the original nanoVNA and the V2 fit perfect in the 100x60x25mm box you can find very cheap on eBay. Example: 5 for 4 Euro
My plastic manipulation skill are not perfect but the unit is well protected and at such a price per box its no problem if you destroy one.
Just make a hole in the click in cover and some holes in the side for USB and SMA. As there is no battery no need to expose the switch.
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NanoVNA Wiki:
/g/nanovna-users/wiki/homeNanoVNA Files:
/g/nanovna-users/filesErik, PD0EK