Thanks, I think backglass videos will be best way forward. Only played around with two tables so far and already notice the blank DMD space on each B2S doesn't quite line up with each other so will be impossible to get the DMD video in the right place.
This has lead me to another issue though, I can't get both the table video and backglass video to play at the same time. One will work fine but the other will be a black screen. If I reboot sometimes it swaps around. If I remove the video file then it show the static image file file and the other video will always work.
Using 2.14 on Windows 7.