what about blender?
The 1x1x1 brick size is 1.0 1.0 1.2 in Blender units and 1x1f plate is 1.0 1.0 0.4. (Or the default cube scaled 0.5 and 1.2 Z for 1x1x1.)(1x1x1 is 0.5 0.5 0.6 Blender units when using 3dtoblb or obj2blb.)