Also (referencing a side comment) the only mention of the size of Gollum's boat in that PDF (and it may not even be his boat - I'm not an expert on the source material, just going off mentions of "boat" near "Gollum") seems to be "little black boat" but that's pretty quickly followed by it fitting 4 people at a time which isn't all that "little", really, and I think the large Gollum in the illustration could fit in a 4 person boat (albeit in a perhaps top-heavy fashion.)