I'll be honest. I've been watching Transformers and reading some of the comics since it first aired in 84 when I was 7 years old, and I've never heard of Guiltaur, but I got a commission to turn Universe Onslaught into him. I was sent one reference pic (last attached pic) and given instructions on what colors to use and where. Here's how he came out. Apparently Guiltaur is a mix of Optimus and Megatron. Kinda nifty.