You need a LED stripe that is wound through alls segments in an S pattern and then continuing to the next digit while the stripe being upright on its side. Selecting *debug* gives a better idea how things fit together.
Adding a defusor on top or at the bottom of the segment holes will probably enhance the visuals. Just using paper may be enough.
There is currently not a lot of space for elecrtonics and this generator is still untested. Good luck!