Whilst it is HERESY! to mention it, the Thorian Sourcebook describes a small warp capable cutter which presumably would be crewed by only a few dozen.
Less Heretical, although still small is The Wandering Star, the cargo carrier owned by the trader Rugolo in the novel Eye of Terrpr. It is described as a mere ninety feet high and is dwarfed by every other vessel. It is said that at ninety feet high ordinary people wuold think it massive but to sapcefarers it is tiny and the interiror is described as gernally cramped and claustrophobic in certain areas.
From the same novel we also have the Inquisitorial Null Ship, with a crew of only four and quite possibly the smallest warp capable vessel although only a few exist in the whole Imperium.
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