I've got a couple of 4'x4'x1' raised garden beds. I was thinking of making a similar raised bed, but for composting. But maybe not quite as big - 3x3? And taller - like 3'? 4'? Any suggestions? I would throw in kitchen scarps from time to time, lawn clippings, and dirt as well to help the earthworms get in there and nibble at the organics on the fringes of the dirt. What dirt would I just for this purpose? Just general topsoil? Or should I start with a compost soil? Seems to defeat the purpose a little, but if that helps, that is what I'll do! Thanks for any tips!!!