huge bot updated w pics

ok i just got done doing some mods,iput nylon washer nuts on the rails so they dont vibrate off,my next two things are installing larger gears on the arm motor,these are not strong enough,and maybe a 390 motor for the arm for more powermalso 2 sets of sensors to stop the arm at top and bottom ,any ideas or comments ? thanks !!
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You could consider mounting the base of the arm on a turntable, so it acts like a turret. Thus your arm could rotate and grab things to the side, or behind your robot.

is this your robot for Gateway? or did you make it just because you can?

7 wheels 6 in the front 4 wheel drive with a pilot wheel in the back

try an elbow on the arm it would be cool