Lego Cooperative Testing Initiative

These are Atlas and P-body. Or, at least, they're designed to look like them. To be honest, it kinda looks like Black Mesa got their hands on their designs and tried to make their own version. Then again, they don't look too bad considering Dimensions had them specially moulded.

They have a limited range of motion, about the same as the average lego figure, but they can also swivel their heads up and down.

Nice simple builds they may be, but they're fairly dense. P-body alone is around 35 pieces. In a set on their own they total up to about 74 pieces.

Lots of technic bricks and clips

This is consistent between the models, and serves as a connection bewteen the arms, legs, and personality core.

The first big difference. This gives them that height difference that helps characterize them. Remember, make 2 of each, and have the second one mirror the first!

These can be used either way. The design you choose doesn't matter, it just so happens that Atlas has the more complex design... for now.

Since there aren't any particular pieces that perfectly match the sizes of the in-game cores, these'll have to do.

Basic portal guns, for if you don't have the official one (I don't).

Assemble as shown. Pay attention to how the legs are attached!