dgenr8 Hi !
The system is based on Unity units. I just assume that 1 unit = 1 meter in my demo, but you can display whatever you like.
The grid also snaps to unity units, you can configure it to snap to 0.5units or whatever you need.
You cannot really "enter" values, everything is based on the points snapping on the grid, and you use sliders for walls heights, doors, windows etc, so it's not as precise as AutoCad for example.
But you can definitely display imperial units instead of meters, it's just a matter of converting the unity units. I should actually propose to change the unit system in the settings. Thanks for the advice.