yes that would work but dont expect it to win any thing i did that at the start but i have now moved on to bigger and better things.
cheapest servos(good speed bad torque) easy to speed hack
http://www.giantcod.co.uk/towerpro-s...rvo-p-268.html

batterys
http://www.component-shop.co.uk/
i used both for a while
this is a forum which is more for antweigts which may be helpful
http://www.robotwars101.org/phpBB/index.php