I do not agree with you on the fact that Urgot should be pushed as a marksman. If we take his lore into consideration, he should be Fighter/Tank.
Urgot, once a great soldier of Noxus, may constitute a case in support of the latter. Prone to diving headlong into enemy battle lines, Urgot sowed chaos throughout the enemy ranks, often sustaining grievous injuries in the process.
It wouldn't make sense that a soldier used to be on the battlefield becomes a sniper (or anything like that). And if they change his lore for him to be a marksman, why would he be the way he is? You don't suffer from a lot of injuries when you're shooting from afar.
I agree with you when you're saying that urgot is bland and doesn't have anything really special in his kit. That's why I saied that he needs more depth in his kit.
You've mentionned that him being a marksman and a tank at the same time poses a problem for him. That's why I think that encouraging his to be a Fighter/Tank would be good, since Fighter and Tanks are rather similar.
You think that only his Passive and his Q sould be kept. While I agree for keeping the Q, I don't think that keeping thePassive is a great idea. It causes the same problem that old Sona had with her auras (invisible power). His Q is the same: You won't even realise that you have a passive, except at some rare times. I think that they absolutly need to keep his Q and his E. His EQQQ combo is his defining part of him. That would be like removing Karthus' Ult or Draven's Q or Sion's HP Scaling.
About his ultimate, I love it, but it feels out of place for Urgot. Don't get me wrong, it's an awsome ability and very unique, but I feel that Urgot, at his state, can't use it propely. I would LOVE to see him keep his ult, but at the same time, he may be not the right champion to have this sort of ability.
I agree with you when you say "I don't think they should continue with the obese spider beast abomination.", but only to some extent. They should remove the "obese" part, but I think he should stay ugly unless he becomes something like the fan art here (at the end of this comment)
Urgot is a soldier from Noxus who participated in numerous battles. He got several injuries, but he haven't died. Making him like Porky from Brawl just doesn't fit for his current lore. Sure, they could (and probably will) change his lore, but it won't differ that much from the current lore (See Sion). The only way I could see Urgot not ugly is if he was like a mix of General Grevious and Darth Vader (from Star Wars, I'm guessing you know who Ì'm talking about)
I feel like he should stay the half-dead guy without legs.
I saw this concept art and it's really nice: http://theredocelot.deviantart.com/art/League-of-Legends-Urgot-371679646