Coming to a design website and asking help stealing plans for a boat currently in commercial production is generally considered bad form. Location: Eustis, FL I don't know of any free aluminum, welded jon boat plans available.
Location: Washington 6 foot wide plus the flare to the sides generally comes out to a boat about 8 feet wide, which is the maximum trailerable width in most states. Location: New Orleans It depends on what type of ribs, and the attachment methods, and how much you are willing to spend.
In a large commercial shop you would likely use a hydrolics press to stamp the shapes out of aluminium plate.
For a one off build, either a Hand break machine if you have one available, or if not cut each piece, then weld it into place. Location: Washington Where I come from braces are what dentists use to straighten your teeth.

Location: Seattle, Washington, USA Then there is the Brace and bit when you are drilling a hole by hand using a Wood Auger Bit. Location: The Loft Good one Saildude, there is only one tool there and yet a brace is classed as two? Location: Seattle, Washington, USA The Brace by it's self does not do much so you need the bit for the Brace to be much more than a wall hanging (OK you can also get countersinks, screwdrivers etc. Seattle is Mostly sunny today and Sunday - high about 66 degrees - - But if we wait until Tuesday or so the showers should be back to normal - Saildude View Public Profile View Saildude's Website View Saildude's Gallery Find all posts by Saildude Page 1 of 2 1 2 > « Am I crazy?
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. I would suggest thinking of either buying a boat from the manufacturer, likely for what it would cost to build, or looking for free plans of a similar type of boat.
The first is that maximum width of a boat on a trailer is 8' so any wider than this means you have to have special permits.

You could probably do most of the entire construction of a boat in just a few steps, though the set up cost would be million. A hand break is usually found in even small metal fabrication shops, so you might be able to either pay them to form the sheets, or rent access to the machine for a relatively small fee.
Unless you are used to doing this type of work, asking them to do it is probably a better option though. It is of course possible to weld three plates together to get a 12' wide plate, but this is again additional cost and complexity.

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