Answer by  
                                                                                          Latin4 (11170)
                                                            
                          
                          
                                                          First you need to give the engineers a design of what you are going to do and they need to approve it.  If it is approved, then you start with a shell of the design. Get the frame work secure and start adding the roof, shingles and gutters.  You will need a railing and a railing down the steps.