It is a relay system, 2.4 taranis to Dragon link for RC control, & telemetry back to Taranis.
One end holds the DL TX, center section is for the battery, other end holds the X8R, 3DR Telemetry radio for short range to computer, & a teensy to convert Mavlink data to what the Taranis wants.
Bottom has a channel for the wires to & from the DL.
Below is the STL file for it. Cant's say it's fully my design as I used a few other STL's in the design.