I am planning to build a new outdoor staircase for the house and want to cast the steps myself, I am thinking of the top step being 120x120 cm and the other steps 120x80 with an overhang of about 40-50. I am considering a steel frame to support all the steps and I am thinking of installing heating cables in the steps like Multiflex 27. I have uploaded an inspirational picture. I would appreciate any tips as this is completely new to me, especially when it comes to casting. //Jonas