Should be easy enough anyway. Remote drop-clips are as old as the airplane. Say the explosive is clipped somewhere on the mech and can be dropped and detonated from within the cockpit. You'd just have to jump up on the powerplant, drop it and jump away while not looking at the explosion.<br/><br/>I bet you have no idea which famous general from history that Old Guts'n'Bones is based on.  ;D