Last year, I used set 31086 to build a Transformer space cruiser. It was OK and has a Misfire vibe there for his jet rear/legs. However, due to the limited parts from this set (about 160 parts) for me to use, the leg design was pretty lean with stumpy feet. He kept toppling down on my shelves from minor vibrations.
(video tutorial below if you're interested to build one)
So finally I decided reboot this set again, giving it another shot, and Twinjet is born! To differentiate it from my first attempt, I have decided to give it two cockpits. And of course... improving his legs as well.