There's a really horrible looking outpost design I've been wanting to use. Probably would want to have a nearby cart to haul the mats but... build a single block square stone pillar to max height using Hoe 'raise ground' - use beams out from that to give you enough support for a 3x3 (measured in 2x2 floor pcs) platform - should be enough for fire (in the middle), bed on one side workbench on other some walls and a roof with chimney.

Fun part is figuring out a way in and out - especially if a wondering troll takes out your ladders.