Any way you could point me toward a reliable source for how to build and operate one? I don't trust the results from blind googling anymore.
This isn't actually a thing. You will die of normal ethanol poisoning well before consuming enough methanol to cause blindness when drinking alcohol you made from distilling something you fermented.
The blindness thing is some nicely placed Prohibition-era propaganda combined with the addition of methanol to alcohol-containing products that managed to make its way into the public psyche.