Rick
That rigging looks great so far, light years ahead of what I could do. You have the wire running to the "H" strut leaving on the same angle it arrived on. That is a feat few can accomplish. I have banged my head against my hand all afternoon trying to figure a way to do those "H" struts in metal and I can't see how without expensive custom equipment.
Only thing I can think of is using carved wooden struts and to pin the cross bar with pins long enough to protrude out the front and back. Then use Gaspatch turnbuckles and hook each one over the protruding pin. You might have to use 1/48 size to keep the pin diameter smaller and also so the 4 wires don't stack up too far out of plane. Not real helpful I know, but all I could conjure up.
OTOH those Spads look so darn good, whose going to notice a whip-a-diddle in the rigging. (I know...you will)
sp