I have a Snap On KRA-647 Centre section like this
Which is approx 34" (855mm) wide, 18" (460mm) deep, 12 1/4" (310mm) high
Between this, which is sat on a worktop, & my seperate Mac 10 draw toolbox, which is sat on its own 3 drawer centre section (Britool) Im running out of space for my tools...