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I'm sure your boyfriend would know, but for the "just in case" ... tell him he'll need to use different rods to weld the stainless - if he uses the same ones he uses for high carbon steel, you'll end up with rust spots in your soaps at the joints.

Stainless molds make it a lot easier to control the heat of the soap.

You don't need a silicone lining inside, but a liner (it doesn't have to be silicone - any soap-suitable flexible sheet would work) is handy if your mold is stiff, otherwise you will be left waiting for the soap to release from the mold in it's own time. Upside: stainless molds tolerate being upturned and thumped (to get the soap out) really well ...