It has the same Lego gear and axle assembly as the previous vectoring thrusters, although I changed the gear ratio to 2:1. I used Lego rods at the motor mount beams, extending out 50% more than the toy blimp to get better turning leverage.
But the really cool thing is that I added RC control to the Blimpduino's autonomous control. That way I can fly the blimp manually to test different motor and vectoring strategies and otherwise understand the blimp's aerodynamics.
The way it works is that under RC control, I connect the RC receiver's channel 1 (steer right/left) to the ultrasonic sensor port, and the channel two (steer up/down) directly to the vectoring servo. I'm writing some Arduino code to read the channel 1 PWM on the ultrasonic port pin and convert that into signals to the Blimpduino's two motor driver chips. Basically that ultrasonic sensor port now has dual functions, depending on which program I'm running.
When I want to fly autonomously, I just take off the RC receiver and have Blimpduino control both the vectoring servo and the motors itself, connecting the ultrasonic sensor back to its regular port.
The Li-Po battery (the red thing underneath the receiver at the back of the board) powers Blimpduino and also the RC receiver, via the channel 1 port.
Other parts needed:
Here's a close up from the side: