At the moment this can only be built in dark blue colour, as part 18746 and 29119/29120 are only available in same colour of dark blue, unless you don't mind spray painting Lego parts.
No PDF instructions but the Studio file is for sale, payable via Paypal.
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Building Instructions For Sale
This is a Premium MOC, and the instructions to build it are being sold by the designer (KMPMOCS) for $4.00
You will receive building instructions of type 3D File - Stud.io from the designer once you have organised payment with them.
Use BrickLink's Stud.io to open these files.