It's not impossible for the S/X modules - who told you that?
It takes about 3 hours per module, and the fun, in an otherwise boring menial effort, starts when you accidentally pierce a cell while chiseling it's bretheren out.
Roman candle that goes off, which then starts the clock on getting it out before it lights off its neighbor(s). The three year old watching me work the cells out from a safe distance was amused.
You want to do this outside...
It takes about 3 hours per module, and the fun, in an otherwise boring menial effort, starts when you accidentally pierce a cell while chiseling it's bretheren out.
Roman candle that goes off, which then starts the clock on getting it out before it lights off its neighbor(s). The three year old watching me work the cells out from a safe distance was amused.
You want to do this outside...