Here's another thought:
303 stainless steel is not corrosion resistant.
303 has a magnetic pull to it. Magnet won't hold to steel but you can feel it pull to it. That means it will corrode.
I use to be a structural inspector on submarines and I've seen 1" thick 303 stainless steel have 20% of it corroded away in less than 3 years.
That was Saltwater but still if I was going to go thru all that work I would get the piece made out 500 series stainless.
Just my 2 cents worth.
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1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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