The head movement is thanks to LEGO’s own Power Functions pieces, with a small motor being operated by an IR remote. The eyes are also part of the Power Functions line with two small LEDs being run off of the same LEGO battery that moves the head.
The arc reactor is the only non-LEGO piece as it’s a simple LED head torch.
While you may be disappointed that this isn’t a purist build, it was the right decision here. Having played around with the official LEDs from LEGO that were used in the eyes here, we can confirm that they’re not nearly bright enough to create a convincing arc reactor.
The completed bust is apparenly 1:2 scale and made up of 1 150 pieces.
Make sure you also give the video below a watch so you can see a partial deconstruction and all the cool techniques that went into this.
And if you’re in the market for a full Iron Man suit we suggest investing in a 3D printer and lots of filament.