I was browsing thorough some pictures, then I saw the resemblances. It just look like they used the WFC Grimlock model and turn it into FOC Optimus. The transformation look almost the same as well. Replace the threads with wheels. On Grimlock, the front threads are attached to the shoulders, while on Optimus, the wheel goes to the back. Other than that, everything looks the same to me. So, who's going to try customise the deluxe FOC Optimus into WFC Grimlock. Yes, I know many people would not accept Grimlock not being a dinosaur based. But I'm not from that generation. The idea just seems interesting to me.