Iroquois catamaran rigging

[JasonDS]

These are old UK built cats and I have one. I've done almost everything myself in the refit but I'm stuck on rigging. How do you tune a cat (no jokes please :-) ). I know nothing about rigging except it holds the mast up, distributes loads and can change the shape of the sail by raking. I don't even know what type of rig it is my mk 2 has. Any help appreciated.
Thanks

[double u]

here
https://uk.boats.com/reviews/6-of-th...fy-catamarans/
you find a pic with a simple masthead single spreader rig, babystay, double backstays. afaik the earlier versions had a fractional rig with a big fully battened main.
if you just exchange all the wires with wires the same size the "cat should be tuned" fine