I built a 28 VDC GPU for the Baron. I wanted to both strain relieve and manage the cables as well as provide a carrying handle for the unit. Additive technology to the rescue. This part is printed out of PLA and probably 50% fill. Print two of them and secure with 6-32 x 3 inch screws.
Here’s what it looks like:
Here’s the STL file if you need it: