This LEGO TF was built last year, one of the my final project of the year using a single official LEGO set. Only recently I managed to prepare a video tutorial on how to build him. Transformation between robot and jet mode doesn't require reassembly of parts. Go grab LEGO Creator set 31086 now and follow my video tutorial below for building instructions: 31/1/2020 Update: I made a mistake in 13:40 into the video: Not enough 1x1 gray tile to complete the right arm. To fix this, please use a 1x1 transparent green part as a substitute and resume building. Have fun!