OK, here's the photo. Unfortunately, you really can't see the gooseneck.
There's a triple block hung from the tack of the sail. There's a double block pinned to the base of the mast (a pin goes through where you've got a single block shackled - that's the pin the boom-end pin is supposed to go on).
The reeving sequence is:
Through port cleat and down to sheave in mast base
forward to aft through port mast base sheave
aft to forward in port side of triple block
forward to aft through port side of double block
forward to aft through center of triple block (this reverses the "rotation")
aft to forward through stbd side of double block
forward to aft through stbd side of triple block
aft to forward through stbd mast base sheave
up to stbd cleat turning block and out the cleat.
Tie the ends on the front corners of the wings so you can adjust from the trapeze.
This gives you the maximum 6:1 class legal downhaul.
Clear as mud?