Originally Posted by kokopelli dream'n
is there a cad program already with school bus dimensions already plugged in? I know it's putting the design before the horse i mean bus but it will help me to my decision on what to buy and if my plans will work.
The most common CAD file format is .dwg, The CAD program won't have the dimensions "plugged in" you will need to get a file or template file.
Usually you can import and convert different files in common formats in most grades of professional software.