Wow! I think it came out awesome! Especially for your 1st ever lighted mod. Are you kidding me!? You totally nailed it! Exceptionally done!
As far as trying to improve upon it... Looking at the original sign, the waitress server looks awesome lit up. She pops and stands out. Gives the sign depth and dimension. Kinda 3D like. I think that's the only area on your mod that you could try and replicate and improve upon from the original.
I know that would be a crazy amount of time, work and effort to try and make with the EL Wire, but my word, if you could nail that, it would make your sign phenomenal. So much so, I bet you could sell them for a pretty penny. If I had a diner (super fun game), I'd buy one off you.
GL whatever else you decide to do on it and I look forward to checking back in on your thread.
Again....AWESOME JOB!!!