I am very busy 3d cad designer. I design for expensive house market in United Kingdom. I make apps for my self to simplify my work. I could design, 3d cad model staircase with balustrade in a day.Railing Calculator has everything what I need for design balustrades, railings, balconies, panels.
You can find some calculations on my web page: http://architecturalmetalwork.info