as long as all the parts in your game stay square you could use selection boxes in every part and make the part have the neon material with a fully black color. it replicates your drawing pretty clossly
If something were to not be a in the shape of a box you could use highlight. although there is a limit on the amount that you can spawn and you cant adjust thickness. (you can put them in models or parts)
Edit: here is the diffrenence between selectionboxes and highlights, if your just using it as a outline.
Edit 2:
you can also make all parts completly black as well by setting ambient and outdoor ambeint to (0, 0, 0), setting brightness to 0 and making the skybox completly black (just find one in the toolbox)