I still haven't found a suitable GPS tracker to attach in Australia, which works on the 3g network. But I will certainly attach one, as soon as I find one, or hopefully somebody on here can suggest one which will work.
Upgrades. Hmmmm
Put a new "skin" on it. Upgrade the motors. Install new TX and RX for more range. Go FPV for a new outlook in flying. A camera. CF props. Upgrade bearings in motors. More lights. Night flying. Prop balancer. Extra and bigger batteries for extended flying time.
Just a couple of ideas.