I used HiTec 225BB mini-servos all around, the supplied push-rods are fine when used in push-pull as shown in the instructions.
Your .35 or .40 will work fine and help keep the weight down so the slow speed performance of this plane will really shine. I used a Leo .37 on mine and it will fly straight up from a vertical hand launch. I also used a lite battery pack (4 AAA NiMH). These items with the mini-servos resulted in a all-up weight of 3 Lb. 10 Oz.

Keep it light and you will have a ball....... Bob