I have one of the first version of the extra and was flying it with a moki 2.10 using a 20x8 prop. This is a great flying combination.

If possible reinforce the plywood servo mount tabs in the wings with epoxy+cloth. I think you mentioned in your thread that you used epoxy, this will probably be sufficient.

Also, take the suggestion of using the cline reg., this is well worth the money and makes the 2.10 come alive as well as improved reliabilty.

The only other suggestion would be to be sure to use metal geared servos ONLY.

good luck. You have an awesome aircraft that you will enjoy.

Mike