I will be digging trenches for footings for a raised foundation house. Instead of investing time and money in forms or doing a sloppy job of pouring into a raw trench, I would like to build an attachment that is a single, large blade. I would dig the raw trenches and then slice the sides with the attachment to make them more uniform. Is this feasible?
It would depend quite heavily on the soil type, it's moisture content and how careful you can be to not bang the walls.