broken seams and bulges

 From:  bisenberger
4750.1 
Hi, I imported these curves from Rhino (they are part of a bigger project). They started out as a circle with a line on each side (snapped to quad) The circle was trimmed with, and then joined to the two lines. The resulting curve was offset and the inner curve was moved down slightly. The two profile lines were added and then the curves were exported to MoI. I used a one rail sweep for each of the outer surfaces. The rails were then closed by adding and joining lines to the bottom of the rails and a planar surface applied. The image below shows the results. If someone can clue me in on what I'm doing wrong or indicate a better way to do this so I don't have a broken seams and bulges it would be much appreciated.
Thanks,
Bill