I hate to be the bearer of bad news, but just in looking over some of the ab-plate details alone you may have some issues. I may be mistaken, and it could very well be the image supplied on the site but both ab-button panels may be too different for even Basic approval. Some GMLs could very well pass this as is, but some may scrutinize it more.
1. The right indented vertical panel looks awfully deep, and the rectangle inside it should ideally have rounded edges (not squared) and should sit higher (in line with the second button from the top).
2. The raised area that the large button plate sits on looks to be a separate piece instead of being molded into the chest plate.
3. The small ab-button plate appears to be set too deep, and the top gray button on it should be aligned with the top gray button the large one.
Again, I don't mean to rain on your parade but these are just few things that jump out at me. Would the general public notice these crazy small details? Never, lol, but it's just a heads-up, and hopefully you may be able to alter the 3D designs before printing them if you want a set of armor that more closely matches those seen onscreen.
Although the site states that "You will not find a more accurate set of files" (which may be true) it does in no way guarantee 501st approval.