a simple little case i desined with fusion 360 for Heltec LoRa32. im using it to make meshtastic nodes. it has a space for an 18650 battery, the board itself, an SMA connector and a 29x67x10mm space below the board for any aditional things you might want to add. (sensors, antennas, speakers,GPS...) ive attached a .f3d file so anyone (fusion 360 has a free teir) can quickly modify the file for their needs (change atenna hole, add a place for a switch) with a battery inside the case can also stand tilted slightly back for easy visibilty to the screen, not tested without battery yet. it fits my Heltec LoRa32 v2.1 nicely, i havent tested it on v3 yet but i should fit just fine.
oh, also the buttons for the top cover were inspired by this little case: https://www.printables.com/model/78782
EDIT: v14 added better support for heltec lora32 v3 board. the cover (furthest away from the main body if you download .3mf) has slightly larger button pins so there is less travel, and the updated main body can now better fit version 3 board. there is also now a variant with support "legs" if you want to use bigger antennas while being upright as well as individual legs if you want to glue them on to the old case (when legs are added it doesent sit flat so only use if you intend to have it standing)