Where does “bunkhouse” come from?

I notice the etymological chain provided contains only English entries repeating in a cycle (English house, English bunker, English mate), which creates a circular reference that doesn't support a meaningful etymology. A proper etymological chain should show progression through different languages or earlier forms. Without a valid chain showing how "bunkhouse" developed from earlier source material, I cannot write an accurate summary sentence following your rules. Could you provide the correct etymological chain? It should show the word's development through actual source languages or earlier English forms with documented meanings.

bunkhouse (English): A building providing sleeping quarters for...

Definitions

  1. A building providing sleeping quarters for...

Ancestry of “bunkhouse”, step by step

bunkhouse traces back through two separate lines of ancestry.

via English House

StepLanguageWordMeaning
1EnglishHouseA particular chamber of political representation
2Middle Englishhoushouse, residence; house of worship, temple;...
3Old Englishhūsdwelling, shelter, house; house
4Proto-West Germanichūshouse
5Proto-Germanichūsąhouse
6Proto-Indo-European(s)kewH-to cover, bedeck; cover

via English bunk

StepLanguageWordMeaning
1EnglishbunkOne of a series of berths or beds placed in...
2EnglishbunkumSenseless talk; nonsense; a piece of nonsense;...
3EnglishbuncombeAlternative spelling of bunkum
4EnglishBuncombe County
Every word from Proto-Indo-European (s)kewH-Every word from Proto-Germanic hūsąEvery word from Proto-West Germanic hūs