Structural engineer Cantilever steel square tubes needed to hold up Bay window

We are renovating my home - I am disabled with several life limiting illnesses. One the windows is a bay, supported by three wooden beams that go into the brickwork. They are inadequately cantilevered and the bay is dropping. I would like it to be replaced with three box steels that have a steel strap that extends from the very front on the outside and extend on the inside so that they can be attached to the internal wall, providing the cantilever. Budget: GBP 20–250 Skills: Civil Engineering, Structural Engineering, Building Engineering, Architectural Engineering