I got the order changed . Am ordering the bits from linearmotionbearings2008, which many have spoken of well. I'll get a drawing done so the more experienced on the forum can critique. The long axis design should be ok with the vertical loads on the rails, but on the short axis with supported rails not too sure here - as there are torque and vertical loads from the z-axis carriage and router to account for - the top bearing carries vertical and torque and the bottom bearing carries the torque loading only. I'm sure you guys will steer me appropriately

Thanks
Mike