You see here the brilliantCadBoxSystem with the 1/6 divison: 1/6 = 5 inch = 127 mm
CadBoxSystem is my manifest for the swiss industry norm kitchen after: 
hans hilfiker (hans hilfiker in wikipedia)
These norm is also a standard scheme for the modern furniture constructions.
My whole CadBoxSystem project is built on this standard.
CadBoxSystem is a tool for sketchup!
You have not yet installed sketchup?
No problem. You can download sketchup in a free version