Hi Rick,
I had already finished gluing the undercarriage legs when I received your post. So I tried to redo the setup. A jig is a very great word for what it is you know.

The base cardboard is replicating the 4 holes in the fuselage (I fixed the legs with tape).
The 2nd cardboard is representing the angle (70°) on both sides. The width is approx. 42mm, this is the dimension of the spreader bar. All has to be fixed by tape (the picture is just an exemple and not properly done).
The undercarriage parts are the least fine WnW parts I found till today, although it's good looking when properly fixed. I still had troubles assembling them.
Kind regards
Patrick