mo FAQ 2.4 – Can I build a double track mini-mo that is 8″ wide?
No, a single track mini-mo can be 8 inches wide but, a double track mini-mo can not be less than 10 inches wide. “The centerline of the track will always be 4 inches or more from the edge of the module”. So, 4 inches from the edge to the first track, plus 2 inches between tracks, plus 4 inches to the other side equals 10 inches.