Ok enough riff raff here back to work you slackers
Way bed is test mounted. Picking out the linear motion stuff right now out of Salty's drawers of goodies. Bought these for short money. They're worth about $500 each to buy new. Heavy duty will take about 1000 lbs of force per car.
I even turned the picture so Jimmy don't hurt his neck LOL
At this point I am 4" below my centerline. Less an inch and a half for tables...leaves me 2.5" to ba able to fit another set of rails, cars, and hopefully have enough left over for a tool holder...