John,

Congrats on deciding to build a kit, you will certainly learn a lot. Just be careful to follow the plans closely being particular in making everything straight and square. You'll will then have a great flying airplane.

Now to your question.

Yes, you can have a servo for each aileron without too much an issue. What it involves is having a mounting plate for each servo in the respective wing. The servo can be mounted to where it has the servo arm in parallel to the wing surface or vertical where the servo is mounted internally within the wing. Either way works well, the servo being internal is more eye pleasing IMO; I have birds with each type of installation. Servo extensions will most likely required with pathways cut for the wiring to reach the fuselage through the ribs. Be sure to safety the plug-in junctions or solder servo extensions so they will not disconnect from vibration or jarring. Once installed the rest of the procedure involves programming your radio for dual aileron function. Aileron differential is certainly something to be considered on a Cub. Hopefully you are a member of a club where a more experienced member can give you some additional guidance.

Welcome aboard to building a great part of the hobby!!!