Looks like it's got some blocker in it too.
Not really a blocker. That piece between the uprights, after the pad, follows the contour of the intake roof. Its primary purpose is to prevent the uprights from cracking. Cracks will form in the uprights, immediately behind the pad. From what I understand, once that piece was implemented, issues with cracking were almost entirely eliminated.
The pad and uprights on this loader should also be chromoly.