The frame is based in a common 3d printer chain accessory, for holding the cables.

I had to adjust it a bit:

- made it longer so it matches the distance to have the right aspect ratio.

- added a side strip to fit the PVC bars where the LED strips will be placed

- split the top, which is a separate part. This way the assembly and maintenance of the wiring is much more easier, as the LED strips can be mounted, and then the cables soldered.

Parts are in Thingiverse
https://www.thingiverse.com/thing:4884051