*sigh*
I know why I don't play many point 'n clicks, I'm just not smart enough. At least I got the financial record. ^^"

So, I'm currently trying to get the blueprints, for three days.

Here comes an explaination what I did, but being german, I do hope I don't sound too confusing.
So far, I spoke to the policeman who gives out the documents. But because the documents are restricted... well...
Then I went to Tortoise and unlocked the puzzle box with Anna. I received the key card to manipulate the crane.
I also distract the officer with... uhm... Bennet was it? So he'd explain how to copy things and went with Ray inside to get access to the PC. I found out where the blueprints are hidden (G11 if I remember correct) and adjusted the crane... but...
Yeah, I don't know what to do now. There's also a password screen at the officer's PC for using the crane, but I'm lacking the code.
I assume I need that code? If so, please tell me where to find that code or what else I have to do. That would be really nice. Thank you.

(Please, don't tell me the straight answer, just point me to the right direction.)

The Solution was SO simple...
Found out I had to take a look at Javi's financial records and then talk to Tortoise about it.
Now I just need to arrange the crane, so it would grab me the blueprints, instead of the Will... or any other junk.