For transformation into Attack Mode the middle section rotates 180 degrees, the tricky part is finding the appropriate point of rotation. I used some spare LEGO bricks as placeholders to help me locate the rotation point. The white main section is so pretty but I always knew I would have to break it apart and install a Technic brick on each side (I’ll also have to break it apart to add additional mechanisms for support too). Below is a photo of me lining up the location for the Technic brick:
The line art images that I have are not too much help because they are not really drawn to scale, especially after transformation. Because the artwork is untrustworthy, I had to use my own best judgment to decide how far out the white section should protrude after transformation.
This week I’ll have less time to spend on this, I have to get back to real life! Also, progress is limited until I receive my new LEGO orders from Bricklink. Best case I hope to at least finish the leg by the weekend.