I am considering using QCad for some house plans and apparently it does not support architectural coordinate entry (e.g. 12' 4 1/2,10' 5 5/8). I am able to get reasonable results by using a little math (e.g. 12*12+4+1/2,10*12+5+5/8) but this is very inconvenient! Google SketchUp would be an excellent example of how to do this!