making your own worm castings soil is a super idea ... when I was a kid, we used to raise worms for sale to fishermen ... the best method was an old refrigerator, or even an ice chest, lying on its back, lid closed, full of the best dirt we could dig up somewhere, a few tornup newspaper sheets, and coffee grounds ... the worms love their coffee in the morning ... too wet will drown them ... yup, stunk bad enough, I wouldnt want it indoors with me .. pretty much just an old, musty odor, but not pleasing ... kinda gives you a free look into your future grave ...