My 4131's I believe are nylon gear. The 8411 will be good power for the rudder, but take full advantage of its torque with a good metal servo arm. 4131's will definitely work for your elevators, even if you incorporate 3D rates, so I'm sure your 7005 servos will be up to the task for sequence flying.

Here's a couple things I learned with my plane:
Mount the rudder servo in the pull-pull mount. Mine with a Brison 3.2 came out tail heavy with the rudder servo in the back.

Make a paper tube like you did for the aileron servo extensions and put it in the fuselage to keep you elevator servo extensions neat and tidy.

Use a pushrod guide tube in the fuselage for the antenna to keep it separate from the elevator servo extensions.

Use a Sig tailwheel unit or other good quality unit.

Get thick gauge servo extensions. To save money get them from Batteries America or Ace brand etc. Don't get JR brand extensions - too expensive.

1800mah pack should be considered the minimum. I got a 1400 pack and it's only good for a couple flights before it starts to get pretty low.

I'm sure there is more I learned while building this plane, but those tips should get you started for now.