Unfortunately the kit I was talking about is just the parts as we dont sell a fully assembled version yet. But since its a kit you can use your own radio from the IRIS+ with it. However we do offer a drone build service so if that is something you are interested in please let me know and I can get a quote sent to you.
The mini unmanned hawk is the essentially same autopilot (pixhawk based system) as the one used in the IRIS+ so it will be capable to perform mapping applications.
As for a gimbal, if you let me know what mirrorless camera you plan to use I can make some suggestions.
The U580 includes retractable legs in the price of the frame so there is no extra charge for that.