Great pics and description, (can tell a fellow card-carrying builder).

A servo in each stab has been posted here before, but with the improvements in linkages and design that may unnecessarily complex now. I placed my servo above the wheel and even that could have been moved forward. As with any copy of a radial warbird, the nose on the 'Bear is short-coupled, to the point they moved the battery above the engine. It's difficult to balance weight added to the tail.

You obviously have the skill and tools. You may want to strip the bottom surface of the wings, as well. You will be shocked at the construction, especially in how they mount the wing tube. If you copy my setup for the gear mounting it will be bulletproof and you can tailor it to fit whatever retracts you decide to run.

It would have been nice to add inner gear doors and really not that hard to form by lamination. Unfortunately I have so many systems stuffed in there a central micro servo and linkage would be difficult or impossible to add at this stage.

Was curious to know if anyone has measured the wing washout of the stock build. When I redid the Bear I built in 2 1/2 deg negative and it's behavior was radically different.