No guarantee, but this size should work in a SCAT machine. I had a friend do a 50cal ammo can in a SCAT machine after a kayak trip. As always bring some rubber gloves, lol.
Take photos once you build your groover.. I am very interested, as I plan on some small group trips and a trip with just my wife, and full size 20mm rocket box is overkill and takes up to much space in my little boat.
My only downside is I already have a 20mm dedicated as a groover. I'd only switch to a smaller poop box setup for cheap.