just few sugestions for replacing herakles.
there is cargo pod missing with first and second. engines are 2 on wings and 2 somere else. on third there is separable lower part as cargo hold - not finished yet.
cargo holds would be 5 wide with 2x3 wide doors. plan is to make doors able to open and close for more cover. cargo hold would be smaller than in existing herakles where in my opinion is too big.