Here you can find the hardware files and build guide.
Here you can find the QMK config for the TOTEM.

TOTEM is a 38 key column-staggered split keyboard running ZMK or QMK. It's meant to be used with a SEEED XIAO BLE or RP2040.

• fork this repo
• git clone your repo, to create a local copy on your PC (you can use the command line or github desktop)
• adjust the totem.keymap file (find all the keycodes on the zmk docs pages)
• git push your repo to your fork
• on the GitHub page of your fork navigate to "Actions"
• scroll down and unzip the firmware.zip archive that contains the latest firmware
• connect the left half of the TOTEM to your PC, press reset twice
• the keyboard should now appear as a mass storage device
• drag'n'drop the totem_left-seeeduino_xiao_ble-zmk.uf2 file from the archive onto the storage device
• repeat this process with the right half and the totem_right-seeeduino_xiao_ble-zmk.uf2 file.