To begin mounting my fuselage to the engine stand I first mounted two 2 X 4s to the uprights at Station 0 - 0, trying to insure they were evenly spaced between the top and bottom crossmembers.

Next I attached two strings from corner to corner at Station 0 forming an "X". I then centered the engine mount on the "X" and marked the 2 X 4s for drilling the holes for mounting the engine stand to them.

This picture shows how I used U-bolts to mount the 2 X 4s to the uprights at  Station 0-0. I placed wedges of wood between the U-bolts and the uprights to keep from denting the uprights when I tightened the U-bolts down. There is a space on each side of the uprights and the U-bolts never actually touch the uprights.

Here the engine mount is mounted to the fuselage and it is placed on the engine stand. Because of the long arm of the fuselage it made the near end (in this picture) of the engine stand very light. I made a little pedestal to put an old battery on to help keep it on the ground.

Here I am reusing the  4 X 4 I had holding the tail post vertical while tack welding the fuselage. I took some 1" tubing and placed it in the 4 X 4 to rotate the fuselage on. I used an old steel ring and some rope with a couple of pulleys suspended from the ceiling to support the back of the fuselage. This allows me to control how much weight is on the engine stand. If you get it too light the fuselage won't always stay where you put it when you rotate it unless it is perfectly balanced, which is hard to do with those clamps (next photo) hanging off of the fuselage.

I mounted these boards to the 4 X 4 and clamped them to the fuselage to keep the 4 X 4 from rotating around the tail post when turning the fuselage on its side.