Currently, buildings are not tied to vehicle-structure mechanics, which would make some ideas more interesting.
First thought: Build ice blocks for igloo structures or something, with weather-related melt checks.
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But what if it melts? Use pipes (plumbing), tank (with coolant), refrigerator, and power to create a self-cooling ice block. Maybe attaching jumper cables could propagate an attribute to nearby iceblocks: access power from X (only one power source connectable at a time). Over time, if an ice block were to melt (comparable to plants transforming), it checks if it can stay cold, and, if it can, fails to melt, consuming power. To “simplify” power checks, when connecting it would check a nearby block for power, and assign power consumption ‘from’ that, while the provider would receive a ‘to’ value. On consumption the power would follow the “froms” until it hits a source. If a wall became broken, it would propagate disconnections down the line of 'to’s until there are none.
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Simple fabrication: snow block. Harder fabrication: ice block. Hardest fabrication: clear ice block, which provides LOS while still being formidable.
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Pykrete! Reduced chance to melt, higher durability, and no visibility. Craftable from snow, and splintered words or paper.
Unrelated, I was thinking of sleds or skis as vehicle supports. Simple would work in winter, high-strength material could provide speed on ground, but not artificial surfaces. A tread could provide the locomotion, like a snowmobile.
Non-snow idea: Underground is much much easier to get rocks from. Unfortunately there’s no makeshift pick, and a true pick is fab 7.
