At the moment we're concentrating on a version for the Cougar, because it already has the ability to attach another grip.
We have looked at other sticks as well (Suncom, X45, etc), but adapting these is much more complex because of all the electronics in the grip, which we would have to fit into our model.
To do this, we would have to reverse-engineer the electronics, and make a different circuit board for each set.
There are plans for a dual throttle, but first we want to finish the stick, and then we'll see what we can do for the throttle.
This may take a while ;)