That's on Rod Findlay's 228 over in AU. I'd guess Short Marine either did it or had it made.Not mine but It inspired me. Maybe it will help you too. Look at Miller Marine too.
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Not my boat in the Captain's video, but that is where I saw it first, then contacted Short Marine. The build a few. Mine was being built at the same time as another.Wow gorgeous work. I'm building one to go in the same spot on the same boat. It's cantilevered out over the livewell, pretty far. So it's comfortable working but I can still use the stock rod holders in front of livewell. Design of legs isn't going to be as nice as yours though! Currently I'm using 2 2" aluminum legs with 4x4" base flanges. Haven't mounted yet. I hope that is going to be stable.
Thanks for the pics. I was screen shoting the Captain video your boat was in to get inspiration.
Besides the drain would you do anything different. Make removable?