Re: how to rig this traveler.
Without seeing the whole system, I'd say two single control lines.
The port control line is secured at the port end of the traveller track, then runs thru the center pair of blocks, entering from ahead, then passes thru the port camcleat where it is cleated. Put a stopper knot in the tail.
Ditto for the starboard line.
Designed to be trimmed from windward side.
Certified...in several regards...