... and you never forget the smell!

Looks quite nice.
Huge board, very busy with lots of useful text.
Gold colored plating - Electrolysis Nickel Immersion Gold (ENIG)? Shooting for RoHS compliance? This type of plating is a good choice and I use it often. Easy to use to compared to other RoHS platings.
J120 (ribbon cable type connection) looks to have enough room at the ends for a shrouded header (boxed in connection) to keep connectors from being off by a row or two. If you can fit in a connector in with ejectors then your customers would love it... but the heat sink below it might be a little close.

Shrouded headers - excellent improvement over the naked headers and saves a lot of headache from having headers off by a row or two. Headers with ejectors is nice to save on ribbon cables but not a must have... just something to keep in the back of your mind. I did notice your earlier boards were not shrouded but I also noticed they were so full that there really wasn't any choice.
Strange that the software shows the pads as yellow - I thought for sure they were the ENIG type plating (which is kinda pricey). Although it is nice, there is no need for this type of plating for a pinball machine. All my boards for work are ENIG but my pinball boards are always the old standby tin/lead plating. Just can't beat that for cost/performance.
What software did you use for the rendering of the board? My Mentor PADS doesn't do nearly as nice of a job at rendering images and it always looks like a throwback to the 1980s.

OH! No wonder why I haven't sold any 74LS240s in months... fixed the website!

Regarding Jameco - I know of one manufacturer that isn't real happy with Jameco due to the parts they stock and where/how they buy them.

Boxed headers aren't needed but the nice thing about boxed headers is they keep blind and/or impatient people like me from installing the plugs off by one row.