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.