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LEGO Alternate Builds: Creator, Transformers, Bumblebee , building instructions

  This page contains grouped links to my creations and Transformers made using official LEGO sets

Thursday, November 5, 2026

LEGO 31129 alternate build #019: Transformer Jet-tank combiner / Duocon

 

You want a combiner? Here you go!

RECAP

LEGO set 31129: Majestic Tiger is the granddaddy  of all Creator sets , to me that is.   Released in the year 2022,  It's the first BIG set I used to build LEGO Transformers and I've made almost 20  !


I've covered so many alternate modes  and popular Transformers  characters  using this set ... from Dinobot Grimlock (above) , to Beast Wars Megatron and Depthcharge.



ABOUT PROJECT JET-TANK COMBINER

I've made  Transformers with tank and jet modes using set 31129 before. What next?  At first I thought.... Misfire !  Then I changed my mind since  prior to this project, 31129 was used to build TF:One Starscream (a Cybertronian jet plane).

Finally...... as a compromise..  this combiner is born! A Transformer that comprised of both a tank and a jet plane combined!

TANK MODE


 

The final finishing touch to this project is a practical one.  The tank sides (forming robot legs) tend to sag when I picked up this vehicle. So I applied a hinged mechanism to secure them in place.



 



JET PLANE MODE



 



TRANSFORM! 










G1 Transformers fans should notice that I am taking inspiration from a Transformer subgroup called Duocons, where 2 vehicles merged to form the robot mode. (like Flywheels , below)





ROBOT MODE



 




MORE ACTION POSES

 




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