This was an old project I had in mind, based off the BotCon exclusive Onyx Primal. However, I had no access to what I needed to actually make this. Until early 2000, when I bought up an old Ultra Magnus, which included a spare cab robot. It was the early rubber wheel version, but it was in bad shape. Poor chrome, black markings, and the joints too tight to transform it. So, I now had my base figure. And I knew I could do this, despite the fact some parts of the Prime cab design don't allow for disassembly without destroying it. Most parts were spraypainted black, with the central waist piece painted with black Testor's, as that part couldn't be disassembled. The smokestacks, upper legs, and headlights were painted silver using a cotton swab. The head was painted with a toothpick for details, so I could retain the red eyes. Painting time took roughly three days. Assembly took a while, as spraypainting was an experiment, and I didn't cover the assembly areas, which required filing on the paint to fit parts in. The metal chest piece required removal of the windshield, which in the process, I put a hole through. But I had a spare from an old junked G2 Prime which I was able to use. In the end, I got the idea to cover the toy with a thin coating of a clear spray enamel. Bad idea. The windshield fogged up, and the left leg gathered a large glob of the stuff as it ran down, and in my attempt to wipe it off, the paint ruined. Reach for my G2 Prime again for the halved of the leg I needed. Fixed. The wheels were applied last, so I could paint the wheel rims silver after the legs were sprayed black. I still had no hands though, and didn't want to spend the money on a set of Prime or Manus hands. Turn to some oversized Rockman bootlegs I have, which came with interchangeable open/closed hands. Taping the pegs of 2 fists over, I painted the hands. They fit, despite a tight fit into the headlights. And they were about the size of Prime's hands. Not seen in these pictures are the Decepticon logos added to the shoulders, after they were taken. I also plan to add silver cab stripe stickers in the future as soon as I can find some. I decided to make this an alternate universe evil Prime instead of an evil clone, as it can lead to more interesting fiction.