I think the three you are referring to as looking the same are similar because of the style people are looking to implement.
I can see a couple of the flaws in the 6 cylinder mock up though, like the kickstart seemingly appears from the centre of the engine, frame disappears below the engine and the exhausts look kind of fuzzy at the edges. Do I win a prize lol.
Thanks to the Dwarfman for some interesting pics too
