I used masking tape to give straight edges for the wing lines but discovered masking tape doesn't do a good jog of masking as it sucks the paint underneath. I ended up doing all the lines on the wings and fins by hand.
I based the jet mode on the G1 toy and the robot mode on how he looks in the cartoon. I also trimmed the inside of his waist to allow greater range of motion for his thighs. Here are the pics, let me know what you think!


I was particularly pleased with the turbines on his chest:
