Antonio da Sangallo ( known as `` Sangallo the Younger '' ) looked at all the different plans by Peruzzi , Raphael and Bramante . He put some of their ideas together in a design that had a very short nave , ( not a long one like Raphael 's design ) and had a big porch at the front . At this point Antonio da Sangallo the Younger submitted a plan which combines features of Peruzzi , Raphael and Bramante in its design and extends the building into a short nave with a wide faÃ ade and portico of dynamic projection .