The problem typically is they want him to look like cartoon Megatron and that requires finding places for tank kibble so his legs and chest look sufficiently G1.
I really feel like some characters, such as Megatron and Arcee, just need new designs instead of trying to fit the square pegs of G1 designs into the round holes of "Trying to make them turn into vehicles those designs have no business turning into."
I kind of wish the real G2 "tank front chest" style transformation had stuck around. That's a great look. You lose the iconic arm cannon, but you could always make it detach and connect to the arm as an option.