Here's an example of some lutrai architecture, a lakehouse which incorporates a number of items taken from shipwrecks. They favor simple materials otherwise - wood, clay, and especially cloth, which is used to create flexible or otherwise movable walls within the structure. Aside from the main entry ramp, there are also bolt holes dropping down into the lake below.

The original drawing is pretty large (11" x 18") and forms a mid-layer setpiece I can put on either day or night backgrounds, eg. for a VN.