Need help making the edges fit of a part.

Hello,

I'm trying to make steel plate which is bend at the edges. I would like to bend it in the upper and lowed edge and then make 2 seperate parts to make the corners.

Its difficult to explain like this but i will show you using pictures. 

In pic 1 you see what i'm trying to achieve. I've used the Edge Flange fuction to make this. Now my laser cuter is too small to make this. so i would like to make the sides from different parts. When i make the edge flange it automaticly gives me these edges, and I would like to keep this using only 2 edges.

I hope someone understands

Thank you in advance !

SolidworksSheet Metal