I built a wooden crate.
Started with a sheet of plywood, placed lower unit on it, then blocked it in with 2x4 screwed through the ply.
placed another sheet of ply on top and screwed it down.
Protected the skeg, prop shaft, driveshaft, and ventilation plate.
Ship it fedex.
Its your job to protect it during shipping, brown paper and duct tape ain't gonna do it.