SUBD Plastic Chair

Rhino Rhino for Windows
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Hello people!

So this newbie is having a problem about modelling a plastic chair.

Inner surface needs to be smooth, just outer surface has the wave graving.
For this model first I draw the outer wavy section then loft it around the seat curve, then I turned that polygon into subd.

Also I had the angle of the inner surface with the same method. Than I bridged them.

But here comes the problem:

If I leave it as a solid subd, I am having much trouble with doing the flanges (on the left).

If I do the flanges on the outer surface than I need to fill the gap between those two. But I cant use /bridge, or /stitch for that.

What should I do? Maybe my method is completely wrong haha.

Thank you in advance

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do the flanges have to be subd? if not you can get the shapes you want then simply convert to nurbs, then close the ends up with a simple trimmed planar surface?

that way you could have much simpler topology inside the chair which will likely make it smoother.

remember, you need only 3 edges to make a corner-