I recently saw this project on Kanojo.de and figured that I could easily do a version in acrylic with the help of a laser cutter. It also helps to make one big change which is to swap the Aperture icon on top for the blue Portal icon.
So where's the orange portal? On the inside of the box. Had to be consistent.
Here's how it was made.
Step 1: Laser cutting the acrylic
The square and Portal cutouts were done in the normal way. Blasting with the laser until it was cut through. For the designs on the tops of the pieces, I did a light vector cut and peeled away the positive, leaving the safety film as a stencil.
Big, big thanks to Zeptozephyr at deviantART for making the vector files I used.