A simple case I designed for the BeaglePlay SBC.
The case lets you mount 2 of the default 2.4Ghz antennas Internally, that way you could use Zigbee and 2.4Ghz wireless for a use case like HomeAssistant without the need for external antennas.
Check out my HomeAssistant + Zigbee Tutorial for BeaglePlay Here - https://www.hackster.io/andrei1998/beagleplay-zigbee-home-automation-using-homeassistant-324e63
There is no “required” hardware except 4x M3 Screws (and optional threaded inserts)
https://www.amazon.com/gp/product/B0B51BFSWZ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
If you want to mount external antennas:
u.FL to SMA Extenders -
https://www.amazon.com/gp/product/B01HXU1PKS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
2.4GHz Antennas Used - https://www.amazon.com/gp/product/B088GWHNCR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Sub-Gig Antennas -
https://www.amazon.com/gp/product/B095JTW6XM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
or
https://www.amazon.com/gp/product/B086ZG5WBR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
The author marked this model as their own original creation.