More Engine Mount progress. It seems to be a dance of two steps forward one step backwards but the progress is in the right direction.
Well I've finally finished welding up the airframe side of the ring mount. Even managed to mill off .4" from each of the very thick/heavy bolt-bushings. During the process I manged to blow through the tubing twice just like in the first picture. The one pictured I was able to repair w/o a patch but the second one (can't find the picture) was twice as large. It needed a band-aid which turned out not looking too bad (second pic).
So with half the mount done it is time to turn my attention to the engine side of the mount. The process was to remove the mount from the airframe, where it was mostly welded to prevent misalignment, and install it back into the jig. Now you probably can not tell from one picture but I'm struggling with what is the lower side of the mount. Those two bolt-bushings extending from the top of the jig will eventually bolt into the engine shock mounts. Thing is, they are really/rather close (90mm). So I'm not quite sure how I am going to mount/brace them. I'll have to work on other projects (brakes, seat) until I decide what design to use.