Loft Issue

Hey guys, I have a loft of two polylines which works as a flap for the upper geometry. I would like to shorten the lower lines a bit, so that the lofted surfaces are not rectangular but trapezoidal (see picture 2). Also I would like the new loft to be seperated surfaces at every edge of the geometry.
Can someone help me?

Loft (520.2 KB)

Wow, cool, thanks for the quick reply!! (511.4 KB)