Thicken Surface into Solid

How do you take a lofted surface that’s open on ends and along it with the lower part a recurve on itself and add thickness, I need 1.30mm & using surface extrude hasn’t worked & other tries.

So, can use advice, continuing to look, thx…

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Try Surface offset with solid option ticked in the command line.

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Got it thanks, lofting is very nice.