11 ga stainless steel is 0.1250 inches thick
26 GA. steel is 0.0179 inches thick.
.1250 inches or 3.18 mm
11 ga
waterjet cutting (for up to 12" thick)... or machining.
It depends on how thick of steel you're aiming to cut. But most job shops process steel with either laser cutting (for thin steel) or waterjet cutting (for up to 12" thick)... or machining.
Impossible to answer without a detailed description.
9GA is thicker than 12GA when it comes to metal.
11 gauge steel is 0.125 inches thick.
26-gauge steel is 0.0179" thick.
$25000
Not recommended.