I did them with led modules, these were led65 (waterproof) with 5cm wire between them.
In illustrator i mirrored the text, then i inlined the letters for a maximum thick edge, but still enough space to place the rectangles of the leds.
So the whole led AND THE MOUNTING STUD system was already designed in illustrator before i exported it to Aspire.
Ofcourse this could be done in Aspire also.
Then i made a backside routing job and a frontside routing job.
It was pretty sofisticated (i must say) for a first time.
I do not think a lot of people do it like this yet.
Enough for a three day workshop class