Update 10/15: I received requests to show the machine powered on with the screens working, and can confirm all 4 stations are working and playable (see photos). Unit has some wear as you can see in the photos.I had one of my own spare LCD TV hooked up through USB to use as the display. The TV is not included, but I can include it if requested, though it's not the greatest display or in the greatest shape as the base is damaged and would need mounting for stability. Either way, any display with a USB port should work so you may want to use your own anyway.
Roughly, the measurements are around 8 ft by 8 ft since it doesn't include the optional benches. My original plan after rescuing this from a warehouse in Ohio was to relocate the main system in the back cabinet into the center console for space saving/weight/design purposes and mounting the TV either off the back of the center console or to a wall behind/above the machine. I was not able to get around to it, but that would be a suggestion if the dimensions ended up being a concern as it would save about 18 inches off the depth. As far as the cards go, I have roughly 7-8 dedicated cards that will be included. A work around I had been using (and what I have to include) are around 30 cards from is the cards from the arcade game Initial D.It uses the same type of magnetic strips and storage system as DOC but the game is much more current and cards are much cheaper and easier to come by. The item "SEGA Derby Owner's Club Arcade Machine Works Display Needed Cards Included" is in sale since Saturday, October 6, 2018. This item is in the category "Collectibles\Arcade, Jukeboxes & Pinball\Arcade Gaming\Manuals & Guides".
The seller is "adcuozzo" and is located in Pasadena, Maryland. This item can't be shipped, the buyer must pick up the item.