Just doing the Gemini 2 conversion now, and i have to say atm its easy. Bit of dremmeling required, but nothing too major - the hardest bit is not breaking through plastic on the ariel section. If it all goes well it will look factory - theres even a nice empty space for the button & LED above the throttle stick
Even the PCB picture JCJC put up on page two of this thread looks correct - although ill test it before i solder.
If it works well this could be the bargain of the 2.4 sets - a 2nd hand Gemini 2 for 20 quid, 2.4 module and reciever for another 30 quid