Well I posted earlier.... its not there!
I'm too am in the mix. I'm installing the Sierra TW in my plane I completely took out the bulkhead and did several mockup test pieces to determine the geometry for the TW steering.
I opened up the belly a bit more and did some reinforcement as there is some weakness around the tail.
I used the steering linkage setup from the TF Giant Scale P-40 by installing the ball link posts on the steering arms and loop wire around the posts. I am doing my info on RCSB.com
Sparky