As I have said before, I like all three models (Cypher especially), and I personally think that Guilliman’s proportions look odd principally because of the angle the photographs have been taken at. I will wait until the 360 degree rotations are released, or I can get a look at the model ‘in the plastic’ (so to speak), before I pass any final judgement, but I doubt that gross proportion errors will have been made in one of the most important models GW have ever released.

As for his overall build, that is probably deliberate. We already know that Guilliman had to be resurrected by a combination of Basillius Cawl’s technology and Yvraine’s sorcery (its seems she was doing a Melisandre – you know nothing Roboute Guilliman..?), and the recent material released by the Warhammer Community site state that his armour contains a potent reactor to power its many systems that include what is described as a ‘life support system’. A Primarch would not ordinarily need one of those, so we don’t know how much of the old Guilliman’s flesh is still present under his armour, and how much is supplementary technology. He might well have been left half dreadnought by the rigors of his close call with the big dirt nap, which would explain why his body is so large in comparison to his head – heavy duty pistons and gears take up more space than gen-hanced muscles.

As for his armour being ornate, well, he is a Primarch after all. The only one of the Emperor’s sons to walk the Imperium in thousands of years is kind of a big deal (like Martin Luther King, Mahatma Ghandi, John F Kennedy and Elvis all suddenly coming back to life and rolled into one big deal), and his armour was likely not created to his own specification but instead created ahead of time by Belisarius Cawl in order to allow Guilliman to come back from the brink. Given free reign, it is not unsurprising that a master artisan of a tech obsessed order of post-humans might have gone a little overboard on the ornamentation of what would certainly be the most famous piece of work he would ever create – imagine hiring a famous designer to create an outfit for someone whose influence is like that of a messiah figure from religious mythology come to life, and then not doing anything to restrain their enthusiasm or stop them adding whatever flourishes they deem worthy. You could easily wind up with just such an outcome. While the ostentation might well not be to Guilliman’s more reserved taste, not only can’t he do much about it if the armour is keeping him alive or is now part of his own body, but he would also have to bear in mind that this level of exaggerated filigree and intricate apparel is exactly what the Imperial citizenry would expect of a returned Primarch, and in desperate times playing to that expectation in order to inspire the fighting ranks would be tactically sound, and Guilliman is nothing if not a tactician and a strategist .

Like the model or loathe it, it doesn’t seem likely to me that it was created without careful thought and an eye to the in-game symbolism it is the tabletop representation of.