Converting to sheet metal

I am building a bracket that is basically a "U" shape but the bottom is angled, since I'm" not real good" at sheet metal I drew sheets(bracket sides) in contextin an assembly and then saved it as a seperate assembly. I then saved the assembly as a part and tried to convert the part to sheet metal. If the sides h=just touch at the corners, SW says this is not valid, If I overlap the edges, it will only let me offset the sides. Do I have to make the sides as one large solid? Seems there should be a way to convert seperate plates of metal to one with a bend...thanks a million....in advance....

SolidworksSheet Metal