Dear
The cost of casting RCC beam, column and slab including centering and shuttering when calculating in cubic feet i.e. length x breadth x height ( thickness)= rs350-400/ per cubic feet including the hiring charges of shuttering material i.e both labor and material.
Design of beam and column depends upon the plan of the building, nos of columns and load coming on them.
Plaster cost very from place to place due to cost of raw material and labor, in general it is Rs 10-00 per sft.
Flooring cost is as per type of floor.