So I did!
*warning: this instructable involves modification of certain small lego pieces*
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also, If you have any ideas for more lego, just - / / REDACTED / /-
Step 1: ASHPD (portal gun)
the pictures are rather self explanatory.
Step 2: CHELL
Step 3: TURRET
well, its your funeral.
I am especially proud of this model, as it's ingenious and about minifigure sized!
Step 4: PANELS!
these infinitely configurable pieces of walls make up the test chambers in portal, allowing for different testing environments to be created. this panel can also accommodate the optional camera shown in the next step.
Step 5: GLaDOS CAMERA
these ones can be easily detached and positioned so that you can easily use them in conjunction with the Aperture Science Panels.
Step 6: COMPANION CUBE
you can get companion cube decals online, just google it, find it, resize it, and print it.
I covered my decals with clear tape to make the cube a little more robust.