Optimus Prime Build Ep. 21: Pack 12 Unboxing, Head + Neck Assembly, Battery Case, LEGO Accessories

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Another Transformer Tuesday on Brickscale Studio! In Episode 21 of our Agora Models Optimus Prime build series, we kick off the final stretch. We unbox the extra‑thick Pack 12, prep and reattach Optimus Prime’s head, assemble the neck, install the speaker, and build the rear battery compartment with a magnetized cover. On the LEGO side, we add the Matrix of Leadership, an Energon cube, and the axe accessory.

What you’ll see:

- Pack 12 unboxing with 4 trays of parts

- Head reattachment and wire management tips

- Neck assembly, tricky fitment, and screw callouts

- Speaker install and switch orientation

- Battery box mount with magnets and metal plates

- LEGO steps 345–359: Matrix of Leadership, Energon cube, and axe

Why watch:

- Practical glue and screw guidance for tight tolerances

- Clear part orientation notes for “1” vs “2” stamped pieces

- Easy access battery compartment for future use

- Progress recap to track where we are in the final four episodes

Links:

- Optimus Prime Playlist: [Watch here](https://www.youtube.com/playlist?list=PLMKzu4xIFSBX-07xL1Llrnk7E_30pMBxT)

- Agora Models Optimus Prime: [Browse the kit](https://www.agoramodels.com/us/optimus-prime/)

- LEGO Optimus Prime: [Official page](https://www.lego.com/en-us/product/lego-titanic-10294)

Call to action:

- Like, comment, and subscribe to help us hit our milestones and unlock LEGO giveaways.

- Vote on the next big build in the channel’s Posts tab: Orca from Jaws, Enterprise‑D, or 1989 Batmobile.

Build stats:

- Scale model this episode: 28 steps, 46 parts

- LEGO this episode: 36 steps, 70 parts

- Totals so far: Scale model 684 steps, 816 parts. LEGO 521 steps, 1,320 parts.

#OptimusPrime #Transformers #AgoraModels #ScaleModel #ModelBuilding #LEGO #TransformersG1 #BrickscaleStudio #BuildSeries #Hobby