Yeah, if you saving space in the basement then I was suggesting to dig down outside since you have to go below frost with your footers. Or maybe where you are you dont. Here we have to go 4 feet below grade to the bottom of the footer so might as well go another two or three and have the thing down to basement level.
Im thinking block walls 6' square with a PT hopper built in the bottom, and a serious drain under the hopper.Wouldnt have to be anything fancy ,just a square hole in the floor over top a stone filled trench leading to daylight or a footer drain that is to daylight. If you do go the PT hopper route ,you can get this stuff from Farm Tek that they line dump trucks with,1/8 " plastic and put it over the PT to make it slippery. Its not that expensive, too you could use those FRP panels from lowes and put them on upside down. They're about $30 for a 4x8 sheet, again very slippery . Sounds like a cool project. Wish I was closer so I could help, messin with coal
is cool, I guess Ive arrived at "old man"