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Aperture Science - Owned Portal trailers for your deliveries

Here's something to make GLaDOS proud: the outcome of S-C-I-E-N-C-E well done.
Deliver cake all around Europe with your own Aperture Science trailers.

You can see the trailers in the video demo.

It took some time to make this mod, and I want to share it with other Portal fans.
To quote GLaDOS:
This was a triumph, I'm making this note here: HUGE SUCCESS.
It's hard to overstate my satisfaction.[...]
Now these points of data make a beautiful line,
and we're out of beta, we're releasing on time

Have fun, and let me know in the comments if you have any issues.