Got my GT2 the day before yesterday and started tinkering away. They said the FrSky X4R would go into this thing with the header pins on but I sure couldn't figure out a way to do it. I ended up stripping the TX down, soldering the wires directly to the board and covering the board with shrink tubing with some cut-outs for the switch and LED's. This thing is really compact (I mean really compact!) and very clean looking. The 5mm frame should take quite a bit of abuse. Here's a few pics from the install.
Jerry
Jerry