Throttle I came up with....

[Maxray]

I designed a throttle based on some of the single the quadrants I've seen. I will be making mine in 1/8" aluminum.
The prototype fits nicely and does not interfere with the stick or my knees. I like having my throttle hand in this position.
I can email the .DXF if anyone wants to improve or modify it to suit their project.

[Maxray]

I got the Aluminum parts cut and mounted. I will be adding a 3/4" black knob to the lever.  
I will be replacing the fasteners after painting the airframe before re attaching. Very comfortable position to operate.
It's not shown but the cable ferrule will be attached to the forward mount tab.