This was a very fun 4 in frame to build. I was able to cram a 20x20 a ESC, FC and the receiver with just 15mm of build space. For the VTX I had to use the RunCam TX200U since there was absolutely no way I was going to fit anything else in the frame. This is one of the best 4in frames I ever flew. It will even carry a GoPro Session no problem!