I am designing a solid to represent the interior of a swimming pool.  The kidney shaped pool has a 42" wall all the way around.  That is the shallow end depth.  The deep end depth is about 8.5' and has a semi circular type shape with sloped walls coming in from the sides and a straight line edge where the shallow end finishes.  I'm trying to extrude a loft to form the solid but it doesn't seem to like having the two profiles with a shared edge (ie. where the shallow end drops off on a ramp toward the deep end.  Help!

Here is the part...