Because the rudder authority of the Cirrus is not so great, and because it's such a great thermaller, I decided in 2018, soon after re-entering the sport of RC models, to make new wings with ailerons and spoilers. I still had the plans and instructions, and I sourced a rib kit from iGull Laser and the spoilers are from Hobby King.
The aileron modification can be seen here in detail.
Here are a few random pictures from the build.
Some Detail on the spoilers (mounted in a wooden box)
Here are the wings done
Here are the wings covered.