1) definately build them

2) Whether you need ailerons is determinded by the dihedral in the wings. If you have plenty of dihedral you can keep it as a R/E throttle plane. If the wings are fairly flat you will need ailerons.

3) Plan for the components before you build. Consider weight, and placement.

This will help you understand the electricpower system.

EVERYTHING YOU WANTED TO KNOW ABOUT ELECTRIC FLIGHT
http://www.rcuniverse.com/forum/m_7100376/tm.htm


Since I have no information on the planes themselves I have no way to give you more specific information or guidance.