This is what we'll be building next. This supports the wings and the engine.

The A-frames were laid out on a piece of plywood and the tops of the tubing (where they come to a point) were tack welded together. This allowed us to move the whole frame over to the fuselage and tack it in place and the top will be centered over the fuselage. Of course, drop a plumb just to make sure.

Note the magnet that holds the tubing in place while it's tacked. I have several of these and they are indispensable.

Here I cut a piece of wood exactly 30 1/8". This puts the 7/8" tubes exactly 31" on center for the typical Piper type wings. I then put a 1" hole near each end so I could attach the clamps.

Now it's just a matter of adding tubes.