The design process is a little convoluted, but I think this is mostly due to my limited CAD experience.   

The excel sheet (See Log 1) generates all the points based on the number of LEDs I can fit in, and then transforms this to the desired aspect ratio. A few other things are done here as well - Construction lines for the text, outer and inner lines for the wood and the perspex lines are all created mathematically. These are output as points into seperate csv files.
  
Fusion is then used to import the CSV data as splines in sketches. The 3D model is built off this data. As fusion struggles with complicated text (text along the spline), the final face sketch is then exported to inkscape for the text, and then reimported back into fusion, where the text can be 'extruded' into the face.
 

The big problem with this is any mistake or update at the start means going back and repeating the whole process. It works, but its not ideal.