Looking at your list of items I see you are using the GB203 gimbal and the video transmitter that goes with it. I have been wanting to do this with my H for other reasons. Was there anything special that needed to be done to make this work.
I know the price is high for your set but when I first saw it I knew there were a lot of high dollar items included so I do not think your price is out of line. You are the only one offering a solution too.
Interesting using GB203. Will the ST16 control it? An overall useful package.