Yep all scrim or x- ply except for the little widow where your head goes ..its nice and soft on the head .
the weight has been dropped compared to the 2006-2007 models ...( i have a friend with one ) It's a similar weight to my old north sail .with no x ply.
you don't have to worry about it been to heavy ..
I love the feel of these cheetah s ...and they are fast ...and handle heaps of wind .and have tonnes of adjustment ....
the battens bend and belly up like a cam sail .they Always keep a nice shape .
There's not many sails out there that can rig on most mast ,as said on their web site

..I've used tushingham ,neilpryde ,north ,and naish SDM & RDM masts on them and they all rig and work
perfect on them .( my other sails are .2009 .6.3 panthers,2007 5.8 se wave and now 2016 cheetahs )
I reckon that says it all.
This is a huge bonus for a sail ,and a new buyer who won't have to change their mast .
Do they feel heavy sailing you ask ?.
they feel light sailing ..? Just a different feel to all my other sails .naish .north .
Its like your always in control of the sail .no scary surprises in gust ..they just release all the un- needed wind ,with no fuss. Super cool in all circumstances.
It sounds like you are looking to buy one .

You won't be sorry 6.0 or .6.5 would be a good size for WA .depending on your weight .