No to the bilgewater into the build. The item doesn't need lifesteal or even that much AD. Make it build out of Pickaxe and Brutalizer and have it at 50AD. Below 50% with basic attacks to apply grievous wounds, not just physical damage (Urgot would be too strong with it). And I wouldn't use lightbringer as it is an item in other maps; just make a brand new item.
I was going to suggest this as an item, but after I typed out the post, I accidentally hit F4. I like 50AD 10 CDR and 10 ArmorPen for the item if it is going to be less than 3000 gold. The problem with giving it more AD is that it has to be comparable to Ghostblade, and if it has too high of AD it will outclass GB easily. I guess 60 AD wouldn't be too bad now that I think about it more. It still wouldn't be gold efficient without the passive. I think lifesteal is overkill, and bilgewater would imply that it would also have an active portion of the item. So yeah.
and
+ 588 gold. 60 AD 10 CDR and 10 Armor pen. might be an okay item.