how to frame round bathtub island

quick question,
going to be making bathtub island for droop in installation. one corner is going to be round, wirh radius 2'. a square island would be made by having 2x4 horizontal (bottom plate), on top of it 2x4 vertically (~2' high, 16" oc) and another 2x4 horizontal (top plate). how should i make(frame) the round transition? Especially the top and bottom plate (any web site showing this?)
thanks.
martin
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is
(top
bottom
I have seen it done with 3/4" plywood doubled up/
--
Be cool,
Longshot
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