The main problem with most autoland systems for small uavs is that they hold an attitude and fly in to the runway. They have little flair. Work fine for light foamies but not great for heavy jets. If you want it for something that works on an rc jet would will likely need things like laser altimeter, differential gps, etc. My experience with the lesser expensive autopilots you end up braking a lot of stuff getting the autopilot dialed in. For hobby applications it really isn't feasible. This is all over and above the aforementioned safey issues of folks flying jets they aren't comfortable landing themselves.