okay, right im going to ignore what i said about not wanting to put you off the robot design, please don't build a pnematic robot for a first feather (besides the fact there are too many flippers) you could potentioly kill, (probably wont though) but could really, reall hurt you. make a moving platform first with say, a basic electric lifter, fight it a few times then think about adding a powerful weapon.
think, you have built only two antweights (well one battle ant

) and while they might be pretty good a feather is a compleaty different kettle of robots
good luck to you anyway

sorry if i have come across harsh