I've been theorizing that a spider legged Overload would be possible if he were upside down in combined mode, and I finally got around to analyzing the awfully transformed Devy prototype to provide evidence for it. I plan on analyzing Scrapper tomorrow!
Honestly, The way I see it, he seems to have his bipedal design. The lower section of the legs seem like they flip 90 degrees to form the feet in some way, and the circled toe details are pretty close to the concept art's.